CN1085311C - Seal ring - Google Patents
Seal ring Download PDFInfo
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- CN1085311C CN1085311C CN97109760A CN97109760A CN1085311C CN 1085311 C CN1085311 C CN 1085311C CN 97109760 A CN97109760 A CN 97109760A CN 97109760 A CN97109760 A CN 97109760A CN 1085311 C CN1085311 C CN 1085311C
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- seal ring
- concave part
- oil groove
- oil
- groove
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Abstract
The present invention relates to an oil groove formed on the side surface of an improved seal ring. The oil groove is used for improving relative slide between the side surface of an annular groove and the side surface of the seal ring. The oil groove communicated with one side of the inner surface of a cylinder acts with a wedge extending to the oil groove along a circumference direction to produce a slant surface formed on the side surface of the seal ring contacting the side surface of the annular groove of a shaft in a slide mode.
Description
The present invention relates to a kind of seal ring of sealing that is used for the axle of various hydraulic pressure and pneumatic equipment, more particularly, relate to the seal ring of the sealing of axle in a kind of automatic transmission that is applicable to vehicle and housing.
As shown in Fig. 1 and Fig. 2, this class seal ring 5 is configured in a pair of circular groove that separates 4 on axle 1 the cylindrical outer surface in this wise, make its each cylindrical outer surface 5 ' contact with the cylindrical form interior surface 6 of housing 2 slidably, thereby the hydraulic oil 3 that is supplied to two oil circuits between the groove 4 is sealed up by seal ring 5.
The cylindrical outer surface 5 ' of this class seal ring 5 is pressed in by hydraulic coupling on the columniform internal surface 6 of housing 2, as shown in Figure 2, and seal ring 5 slide relative between the side 7 of the side of circular groove 4 4a and seal ring.Under this use condition, require seal ring 5 to have less frictional loss and the good sealability of maintenance in long time cycle.
In order to keep good sealing state as shown in Figure 2, the frictional force between the side 4a of the circular groove 4 of the side 7 of seal ring and axle 1 must be all the time less than the frictional force between the cylindrical outer surface 5 ' of the cylindrical form interior surface 6 of housing 2 and seal ring.
When the frictional force between the side 4a at the circular groove of the side 7 of seal ring and axle 1 increases and seal ring 5 beginnings when sliding between the cylindrical form interior surface 6 of cylindrical outer surface 5 ' and housing 2, the wearing and tearing of the cylindrical outer surface of seal ring just increase, the spacing in space is increased, thereby increased from the leakage in this space and reduced sealability.In addition, if very big in the frictional loss of each sliding parts, except that wearing and tearing, because adhesion also may take place in frictional heat, thereby very fast generation systems fault.
Recently, obtain many progress aspect the weight of automatic transmission alleviating for improving fuel consume, the aluminium alloy castings that contains the silicon that approaches eutectic structure is as a housing and an axle part.It is lower that this class aluminum alloy and the ironcasting that uses are in the past compared hardness, thereby wearing and tearing easily.This class aluminum alloy also has an intrinsic problem, and promptly its structure is because the influence of rate of cooling or solute segregation becomes inhomogeneous easily.Therefore, do not exist the Eutectic Silicon in Al-Si Cast Alloys place just to tend to take place wearing and tearing or adhesion in this structure.In addition, during circular groove, this class cast aluminium alloy often causes on the side of groove easily to be torn or similar problem in processing, and this mechanical stiffness and machining condition with the shape of the blade of cutting tool, tool rest is relevant.When the seal ring low with this hardness (being that structure is inhomogeneous) of routine and the not good slidingsurface of surface quality are meshed, tend to take place the slidingsurface wearing and tearing, adhere to and phenomenon that sealability reduces.Therefore need restudy the shape and the material property of seal ring.
For the wearing and tearing of the side of reducing seal ring, people have proposed various suggestions.According to the flat 3-88062 of Japanese Utility Model prospectus (1991), proposing in the literary composition provides helical recess or pectination oil pocket in the cylindrical outer surface and the side of the seal ring that has the rectangular cross-section and be made of resin.But, though former plan is introduced sliding parts to oil effectively from recess or oily pocket, the problem that does not have oil film to form at slidingsurface has taken place just because of recess is provided.In addition, have only when sense of rotation be during along a specific direction, its could the moving effect of generating pump, therefore not only must select this direction but also the danger of being assembled by mistake is arranged when the fitting tight circle.Under the situation of pectination oil pocket, though there is not the problem that depends on sense of rotation, the formation of oil film is considered to not enough.That is to say, on slidingsurface, form effectively the oil film effect can not be just by the content of this suggestion and realize.In addition, the friction equilibrium of forces on cylindrical outer surface and side tends to destroy, thereby seal ring may be fixed on the housing member or with its side with its outer circumferential sides surface and is fixed on the part in two examples.And, because the gap of seal ring is not considered, thus produced the seal ring gap consumingly with axle spare or the contacted problem of housing member, caused wearing and tearing thus and adhered to.
According to the flat 4-84864 of Japanese Utility Model prospectus (1992), proposing in the literary composition provides a kind of oily pocket that is used for storing lubricant oil, sealing circle to be made of resin on the side of seal ring and has the rectangular cross-section.But, should the oil pocket even formed, there is not oil to be drawn on the slidingsurface of seal ring yet.Even on the side of seal ring, produced oil film pressure owing to slide, but since the motion of the cylindrical form interior surface of this oil film pressure and unsteady seal ring still hindered because the cylindrical outer surface of seal ring is flat.Therefore, frictional loss does not reduce, and wearing and tearing and adhesion still can take place and be difficult in and keep sealability in the long time cycle.
According to the flat 6-18764 of this day model utility prospectus (1994), propose a plurality of lubrication grooves in the literary composition and be not to enter into opposite side from a side of the interior or outer circumferential sides of seal ring side, but all along the circumferencial direction of seal ring side.But,, oil film can not be formed fully just because of this lubrication groove is provided.
Because this lubrication groove or concave portions have a kind of influence for the space configuration of seal ring, must make improvements them.According to the flat 6-45172 of Japanese Utility Model prospectus (1994), proposing in the literary composition along the circumferential direction provides a plurality of lubrication grooves, the butt end of sealing circle to be cut out an oblique angle on the seal ring side and forms a plurality of grooves that intersect with this angled end-face that cuts out.But this structure also is difficult in and keeps sealability in the long time cycle.
Therefore, the objective of the invention is to solve the problems referred to above by the seal ring that provides a kind of loss of can reducing friction can obtain good seal performance again, the generation of these problems be link mutually with the weight that alleviates automatic transmission and be difficult to solve with above-mentioned prior art.
In order to address the above problem, the present invention adopted basically seal ring with contacted side, annular groove side on a plurality of oil grooves along the circumferential direction are provided separatedly and keep the device of continuous concave part with this oil groove.
By adopting this device, the hydraulic oil of bottom that enters the circular groove of axle is inhaled into oil groove and is filled in the concave part, when seal ring slides with respect to axle, between the side of the side of circular groove and seal ring, just formed oil film, and the slide relative between circular groove and seal ring can be quickened by the buoyancy that oil film pressure caused.At this moment, concave part works as chock effect generation face and guarantees the generation of above-mentioned oil film.
Specifically, according to the invention provides a kind of seal ring of axle and housing in relative rotation that is used to seal, wherein seal ring is installed in the circular groove that forms on the cylindrical outer surface of axle, have a plurality of oil grooves that separate that communicate with a side of cylindrical form interior surface on seal ring and the side that circular groove is faced, and generate the inclination concave part of face as the chock effect, and this concave part along the circumferential direction extends on two sides of oil groove and links to each other with this oil groove.
The effect of seal ring will illustrate below as constituted above.Seal ring towards the side of circular groove side by such configuration, make a plurality of oil grooves that only communicate and all configurations along the circumferential direction of concave part that generate the inclined-plane as the chock effect with cylindrical form interior surface one side, wherein, this inclined-plane along the circumferential direction is connected with plane on the side of the seal ring of the both sides of oil groove.Therefore, hydraulic oil just from oil groove that the cylindrical form interior surface of seal ring communicates suck, by generate the chock effect at place, inclined-plane in the chock effect of seal ring, the oil mould enters slidingsurface to produce oil film pressure, reduce by the buoyancy that oil film pressure causes by the caused load of hydraulic fluid pressure that acts on the seal ring, and the oil film that forms between the side of circular groove and seal ring has also reduced friction factor.
Frictional force between seal ring side and circular groove by otherwise can reducing with the useful effect that reduces of friction factor and reduce significantly the load of the lateral surface compressing of seal ring on circular groove.In addition, because the oil film between the cylindrical outer surface one side place seal ring of seal ring and circular groove is compared thinner (this is because the cause of seal ring side view and oil film pressure) with the oil film in cylindrical form interior surface one side of seal ring, thereby has improved the oil sealing performance of side.
Because the buoyancy function that the hydraulic coupling that produces by the chock effect in the gap causes, can prevent that seal ring gap end face part and circular groove from taking place to contact consumingly, and by reducing in the face of providing the chock effect to generate frictional loss and the wearing and tearing that the inclined-plane can make otherwise can take place in the gap on the side of circular groove.
Because always less than the frictional force at cylindrical outer surface place, and housing do not slide with the cylindrical outer surface of seal ring the seal ring with said structure in the frictional force at place, side, so excellent sealing ability can keep the long time cycle.Moreover the shape of two sides by making seal ring is configured to identical design form, can prevent the generation of wrong assembling when the fitting tight circle.
Above-mentioned and other advantages of the present invention will be clearer by following explanation and accompanying drawing (wherein identical label is represented identical part).
Fig. 1 is the sectional view of main structure part of typical user mode that a seal ring of hydraulic equipment is shown;
Fig. 2 illustrates the sectional view of major component of user mode that of prior art has the seal ring of rectangular cross-section;
Fig. 3 is the sketch that an embodiment of seal ring of the present invention is shown, and there is shown oil groove and concave part with chock effect generation face is situation about how to form on the side;
Fig. 4 is the sectional view that illustrates along the major component of an embodiment's of the seal ring of the present invention of the IV-IV line of seal ring shown in Fig. 3 intercepting user mode;
Fig. 5 illustrates along cross section of the concave part that forms on the side of the seal ring of the embodiment of the invention of the V-V line among Fig. 3 intercepting and the oil groove sketch with the situation of chock effect generation face;
Fig. 6 is the sketch that is illustrated under the situation of the gap of seal ring of one embodiment of the present of invention oil groove that generates the chock effect of no use;
Fig. 7 is that the gap that is illustrated in the seal ring of one embodiment of the present of invention is provided with the sketch that the chock effect generates the situation of face;
Fig. 8 is that the gap that is illustrated in the seal ring of one embodiment of the present of invention is provided with the sketch that the chock effect generates the situation of face;
Fig. 9 is that the gap that is illustrated in the seal ring of one embodiment of the present of invention is provided with the sketch that the chock effect generates the situation of face;
Figure 10 a and 10b show another embodiment, wherein this chock effect generation face are made two-stage, and Figure 10 a is a top view, and Figure 10 b shows the major component of looking along the direction of arrow among Figure 10 a.
Most preferred embodiment of the present invention is described below with reference to accompanying drawings.In Fig. 3,4 and 5 one embodiment of the present of invention have been shown, its axis 1 is installed in the housing 2 to relatively rotate.A pair of circular groove 4 forms on the excircle of axle 1, and the main body 5a of seal ring is placed in this groove so that hydraulic oil 3 is sealed.Tubular face 6b (being the cylindrical outer surface of the main body 5a of seal ring) is pressed on the cylindrical form interior surface of housing 2 under action of hydraulic force.In addition, the side 7a of seal ring makes it to slide with respect to the side 4a of circular groove 4 on the side 4a that is pressed on circular groove 4 under the effect of hydraulic coupling.
Mainly by a planar section 7a with a plurality ofly lead to the cylindrical form interior surface 8 of seal ring and the oil groove 9 that radially extends and form as the concave part of the generation inclined-plane 10a of chock effect and 10b, these inclined-planes are connected with the planar section 7a of the both sides of oil groove 9 and separate configuration along the circumferential direction in a circumferential direction in the face of the side 7a of the seal ring main body 5a of the side of the circular groove of present embodiment.Oil groove 9 size radially should determine like this, makes under the situation that seal ring is installed on the axle 1 and axle 1 inserts in the housing 2, and it is placed in the side of cylindrical form interior surface of axle 1 rather than cylindrical outer surface 11 1 sides of axle 1.
Concerning the seal ring of the automatic transmission that is used for the passenger vehicle class, the depth bounds of oil groove 9 is set at the 0.05-0.5 millimeter, and its width range is set at the 0.1-2 millimeter.The chock effect generates the size of face 10a and 10b and should set like this, makes that the scope of the size L among Fig. 5 is the 0.2-2 millimeter, and the depth H in this scope is the 5-20 micron.When size H was constant, size L was big more, and the buoyancy that acts on the seal ring by the oil film pressure that is produced by the chock effect is also big more.Be arranged on the number of the concave part on the seal ring and the optimum range of size L and H and can be set in the above-mentioned scope, this scope depends on the size of seal ring, acts on the finished surface Roughness of circular groove of the pressure and the axle of the hydraulic oil on the seal ring.
In addition, when generating that the concave part 10a of face and 10b are configured in very near in the space shown in Fig. 6 the time or when also providing the chock effect to generate face 10a and 10b, the loss of can reducing friction in gap as shown in Figure 7 oil groove 9 with as the chock effect.Though should be pointed out that (see figure 7) need not to provide oil groove in this case, can make gradient or chamfering in the attachment portion between the end face in chock effect generation face and this space of qualification so that eliminate the influence of burr.Have at seal ring under the situation in the space of shape as shown in Figure 8, the chock effect that just can form as shown in FIG. the inclination of extending along the end face that limits the space generates face 10a and 10b.
If concave part is arranged to axisymmetric, the effect by the hydraulic coupling that produced by oil film can produce uniform buoyancy to seal ring, thereby can prevent the appearance in single face space, frictional loss is reduced and the performance excellent sealing performance.
When the shape in space is formed into as shown in Figure 9 extension in cylindrical and outer side surface when being in aspectant position, comprise the concave part 10a on an inclined-plane that generates face as the chock effect and the side that 10b can be arranged on cylindrical form interior surface.The maximum depth of concave part 10a and 10b can be set at the seamed edge in this space.
Though being used for illustrating the shown in the accompanying drawings seal ring of each example of present embodiment all is to be in situation when parallel when two sides, even but when these two sides be when being in trapezoidal state, its effect also is identical with effect, and also is included among the present invention.
Though in the situation shown in Fig. 4 is that cylindrical form interior surface 8 all is that the right angle is connected with two side 7a of seal ring, but when cylindrical form interior surface 8 is connected with side 7a by chamfering or curved surface thereby makes oil groove 9 directly not lead to the part of cylindrical form interior surface 8, then can reduce, and replenish hydraulic oil with more convenient to oil groove owing to stress concentrates on the situation that seal ring is broken.
Though in the embodiment shown in fig. 5, oil groove 9 has the rectangular cross-section, and it can have for example hemispheric shape of Any shape.In addition, make chock effect generation face 10a and 10b have single plane though this embodiment has been configured to, even if it is parabolic, its effect also is the same.Also have, generate face by the two-stage chock effect that forms as shown in Figure 10 a and 10b, the area that makes the chock effect that is positioned at cylindrical form interior surface one side generate face 10a and 10b generates the area of face 10a ' and 10b ' greater than the chock effect that is positioned at cylindrical outer surface one side, act on the buoyancy of cylindrical form interior surface one side of seal ring with increase, thereby sealability is improved.Should be pointed out that preferably make oil groove 9 radially deep equality and preferably make in cylindrical outer surface one side and generate the concave part 10a ' of face as the chock effect and the degree of depth of 10b ' is slightly less than in the concave part 10a of cylindrical form interior surface one side and the degree of depth of 10b.Radially be positioned at the inside of this cylindrical outer surface during in installation shaft 1 at the radially outward edge of the concave part 10a ' of cylindrical outer surface one side and 10b '.
Though should be pointed out that the shape of the side (wherein having formed aforesaid concave part) of seal ring, both made just and worked by single side face, consider from the assembling aspect preferably to form like this, make two side make identical design form.
In addition, though the effect of seal ring of the present invention and effect it to make with resin or metal also be identical.Because the concave part on the seal ring side can be easy to be shaped by a Mould Machining by injection molding, so the present invention can be realized economically by the seal ring of making by the resin of injection molding shaping.
As mentioned above, lead to the oil groove of cylindrical form interior surface one side and generate the concave part that the inclined-plane constitutes by radially disposing a plurality of by the chock effect, and this inclined-plane is connected with the planar side in the face of the both sides of the oil groove on the side of the side of circular groove at seal ring in a circumferential direction, and seal ring of the present invention can take oil film in the slidingsurface to effectively by the seal ring and the slide relative of axle part.Because action of hydraulic force will reduce owing to the buoyancy that hydraulic coupling caused that produces in oil film in the load on the seal ring, friction factor will reduce owing to form oil film between the side of circular groove and seal ring, thus the generation that makes the frictional loss between seal ring and circular groove reduce thereby can reduce wear significantly and adhere to.In addition, owing to be very thin at the oil film of cylindrical outer surface one side of seal ring, so sealability can be improved.
The gap that also can prevent seal ring contacts with the strong of circular groove, thereby reduced frictional loss (otherwise this loss is to be produced by the gap), acting on buoyancy that hydraulic coupling that the gap produces causes by chock has simultaneously also reduced and has adhered to and the generation of wearing and tearing, wherein, this chock effect produces in the face of providing the chock effect to generate the inclined-plane on the side of circular groove in the gap of seal ring.Owing to adopting under the situation of seal ring as mentioned above, in the frictional force between the side of seal ring and the axle always less than the frictional force between the cylindrical form interior surface of the cylindrical outer surface of seal ring and housing, and thereby housing can not slide with the cylindrical outer surface of seal ring, therefore, the spacing in this space will be not can not increase owing to the wearing and tearing of the cylindrical outer surface of seal ring, thereby excellent sealing ability can keep the long time cycle.
Moreover the shape of two side surfaces by making seal ring is configured to identical design form, the assembling that just can not make a mistake when the fitting tight circle.
Though several optimum examples is described above, in the scope of the present invention's design of being narrated in the following claims, those of ordinary skill in the art can also carry out various changes to it.
Claims (6)
1. one kind is used to seal in relative rotation axle and housing and is adapted to be mounted within the seal ring that has the space in the circular groove of the cylindrical formation in appearance of described axle, comprising:
A plurality of oil grooves that separate, described oil groove are formed on side of described seal ring and communicate to the described side of a cylindrical form interior surface of described seal ring; And
As the oblique concave part of chock effect generation face, described inclined-plane along the circumferential direction extends on two sides of described oil groove and is connected with described oil groove.
2. seal ring as claimed in claim 1, it is characterized in that: when the cylindrical form interior surface sliding contact of the cylindrical outer surface of described seal ring and described housing, one radially outer edge in described at least oil groove and the described concave part radially is positioned at the inside of the cylindrical outer surface of described axle.
3. seal ring as claimed in claim 2 is characterized in that: described concave part has the maximum degree of depth in the joint office with described oil groove.
4. seal ring as claimed in claim 2 is characterized in that: described concave part is connected with the side in described space.
5. seal ring as claimed in claim 2 is characterized in that: described concave part length dimension along the circumferential direction is greater than its maximum depth dimensions.
6. seal ring as claimed in claim 1 is characterized in that: the side of described seal ring is symmetrical with respect to a line by described space and its center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109760A CN1085311C (en) | 1997-04-22 | 1997-04-22 | Seal ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97109760A CN1085311C (en) | 1997-04-22 | 1997-04-22 | Seal ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1197172A CN1197172A (en) | 1998-10-28 |
| CN1085311C true CN1085311C (en) | 2002-05-22 |
Family
ID=5171203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109760A Expired - Fee Related CN1085311C (en) | 1997-04-22 | 1997-04-22 | Seal ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1085311C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106795969A (en) * | 2014-10-01 | 2017-05-31 | Ntn株式会社 | Sealing ring |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015111707A1 (en) * | 2014-01-24 | 2015-07-30 | Nok株式会社 | Seal ring |
| JP6314689B2 (en) * | 2014-06-25 | 2018-04-25 | Nok株式会社 | Sealing device |
| CN107429844A (en) * | 2015-03-16 | 2017-12-01 | Nok株式会社 | Sealing ring |
| WO2018167828A1 (en) * | 2017-03-13 | 2018-09-20 | Ｔｐｒ株式会社 | Seal ring and sealing device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059195A (en) * | 1990-07-17 | 1992-03-04 | 约翰起重机有限公司 | Non-contacting, gap-type sealing with sealing anchor ring of patterned microdam |
| US5145189A (en) * | 1991-09-11 | 1992-09-08 | General Electric Company | Hydro-lift dynamic circumferential seal |
-
1997
- 1997-04-22 CN CN97109760A patent/CN1085311C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059195A (en) * | 1990-07-17 | 1992-03-04 | 约翰起重机有限公司 | Non-contacting, gap-type sealing with sealing anchor ring of patterned microdam |
| US5145189A (en) * | 1991-09-11 | 1992-09-08 | General Electric Company | Hydro-lift dynamic circumferential seal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106795969A (en) * | 2014-10-01 | 2017-05-31 | Ntn株式会社 | Sealing ring |
| CN106795969B (en) * | 2014-10-01 | 2019-03-05 | Ntn株式会社 | Sealing ring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1197172A (en) | 1998-10-28 |
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