CN106415085A

CN106415085A - Seal ring

Info

Publication number: CN106415085A
Application number: CN201580030955.4A
Authority: CN
Inventors: 藤井政德; 木津贤; 木津贤一; 池田毅
Original assignee: Mitsubishi Cable Industries Ltd
Current assignee: Mitsubishi Cable Industries Ltd
Priority date: 2014-06-12
Filing date: 2015-06-02
Publication date: 2017-02-15
Anticipated expiration: 2035-06-02
Also published as: TWI591278B; JP6386416B2; CN106415085B; TW201546388A; JP2016014471A; WO2015190353A1

Abstract

A seal ring which has one break in the circumference and has a rectangular cross-section, the seal ring being obtained by molding without the need of machining. In order to make the seal ring exhibit excellent sealing performance, the seal ring is injection-molded from a thermoplastic resin composition into a non-circular shape with the break open and when in use, the seal ring has a complete-circle shape with a reduced diameter.

Description

Sealing ring

Technical field

The present invention relates to sealing ring.

Background technology

In the past it is commonly known that just like lower seal, it is apertured substantially round that aforementioned seal circle has tool at the one of circumference The global shape of ring-type, there is circle main body, from the both ends of this circle main body to prominent the 1st protuberance of circumference and the 2nd protuberance, carry out Compressor can sealing between dynamic vortex and housing, its material is mainly using politef（PTFE）（For example, referring to patent Document 1, patent documentation 2）.

Patent documentation 1:Japanese Unexamined Patent Publication 2007-247526 publication.

Patent documentation 2:Japanese Unexamined Patent Publication 8-276508 publication.

Cylindric politef raw material is mechanically cut into slices by conventional this sealing ring first, then passes through and cuts Cut, grind, the machining such as cutting off processing to be manufacturing.

Therefore, conventional sealing ring has a disadvantage that, expends the machining period of machining etc., having more and send out spillage of material Raw, manufacturing cost is also higher.On the other hand it is also possible to be manufactured by injection moulding, but in the case of being somebody's turn to do, produce as seam and open Oral area, when by seam pairing, might have the circle not inadequate situation of sealing for positive round.

Content of the invention

Therefore, the present invention is a kind of sealing ring, possesses the apertured circular global shape of tool at the one of circumference, tool There are circle main body and the 1st protuberance, the 2nd protuberance, aforementioned 1st protuberance, the 2nd protuberance are existed from the 1st end of this circle main body, the 2nd end Set up with upwardly extending shape week, by thermoplastic resin composition, forming above-mentioned gap is in the circular of opening-wide state Global shape, and, the above-mentioned circle main body of above-mentioned opening-wide state is configured to, with respect to the central point in above-mentioned gap, 180 ° ± There is radius of curvature in the range of 30 ° is maximum sized position, is set to, from this maximum sized position respectively to above-mentioned the 1 end, the 2nd end, with close in the circumferential, radius of curvature reduction, overlap in above-mentioned 1st protuberance and the 2nd protuberance Under the closure state of gap, global shape is in circular.

Additionally, the crooked elastic rate using aforementioned thermoplastic resin constituent is more than 1500MPa, below 6000MPa Resin combination.

Additionally, by the arithmetic average roughness Ra on the surface of the sliding contact surface to object Part be set to more than 0.1,2 with Under.

Additionally, the shape of cross section of above-mentioned circle main body is rectangle, above-mentioned 1st protuberance and the 2nd protuberance are, by above-mentioned circle main body Rectangle the cross section shape of cross section of two points of cut-off rule, the gap overlapping in above-mentioned 1st protuberance and the 2nd protuberance is closed Under conjunction state, in the corresponding surface of above-mentioned 1st protuberance and the 2nd protuberance, there is gap each other.

In accordance with the invention it is possible to omitting cutting, the machining such as grinding, cut off, the generation of spillage of material also tails off, can It is manufactured inexpensively high-quality, high performance sealing ring.Especially, using the teaching of the invention it is possible to provide be appropriate to the sealing of the compressor of eddying motion Circle.

Brief description

Fig. 1 is the compressor sectional view specifically illustrating the purposes of sealing ring being related to the present invention.

Fig. 2 represents one embodiment of the present invention, is the amplification view representing using position.

Fig. 3 is the top view of gap opening-wide state.

Fig. 4 is（Rear site portion is elliptically illustrated）The front view of gap opening-wide state.

Fig. 5 be gap opening-wide state want portion's amplification plan view.

Fig. 6 be gap opening-wide state want portion's enlarged front view.

Fig. 7 is the top view of gap closure state.

Fig. 8 is the front view of gap closure state.

Fig. 9 be gap closure state want portion's amplification plan view.

Figure 10 be gap closure state want portion's enlarged front view.

Figure 11 is intended to the explanatory diagram in the section in portion.

Figure 12 is intended to the cross section explanatory diagram in portion,（A）It is the cross section explanatory diagram of cut-off rule,（B）It is the section B-B explanation of Fig. 6 Figure.

Figure 13 is the C-C sectional view of Fig. 6 and the sectional view of various modifications example.

Figure 14 is the E-E sectional view of Figure 10 and the sectional view representing various modifications example.

Figure 15 is the enlarged view of a portion representing use state.

Figure 16 is the cross-sectional view of a main portion for different embodiments are described.

Figure 17 be for illustrate the dimensional tolerance of the 1st protuberance inappropriate in the case of rough sledding and the use shape that represents The enlarged view of a portion of state.

Figure 18 be for illustrate the dimensional tolerance of the 1st protuberance inappropriate in the case of rough sledding and the use shape that represents The enlarged view of a portion of state.

Specific embodiment

Hereinafter, based on embodiment illustrated, the present invention is described in detail.

As shown in Fig. 3～Fig. 6, the sealing ring S being related to the present invention has at the one of circumference and has the circular of gap 5 Global shape.And, this sealing ring S has circle main body 1, the 1st protuberance 21, the 2nd protuberance 22, aforementioned circle main body 1 occupies 360 ° of ratio Slightly smaller angle, aforementioned 1st protuberance 21, the 2nd protuberance 22 by from circle the 1st end 11 of main body 1 and the 2nd end 12 in circumference Set up upper extension shape.

Represent use state in fig. 1 and 2, illustrate the scroll compressor mechanism 3 of the compressor 2 being applied to idle call Situation.

Scroll compressor mechanism 3 main by fixed scroll 6 with can dynamic vortex 7 etc. constitute, aforementioned fixed scroll 6 with housing 4 modes being close to above housing 4 configure, and aforementioned dynamic vortex 7 can be engaged in fixed scroll 6.On housing 4, with movable The lower surface of vortex 7（The back side）It is arranged with seal groove 4B at relative planar portions 4A of 7A, this seal groove 4B is incorporated with this Bright sealing ring S.

Sealing ring S will be able to seal between the back side 7A of dynamic vortex 7 and planar portions 4A of housing 4（seal）, form back pressure empty Between.（In addition, Fig. 2 is the enlarged drawing in the Y portion of Fig. 1.）

And, as shown in Fig. 3～Fig. 6, using thermoplastic resin composition, form the entirety that gap 5 is in opening-wide state Shape.In figure 3, arrow F represents the injection direction of molten resin during injection moulding, and reference 10 is inlet（Residual trace） Portion, that is, use（Omit diagram）Cutting edge gallantly cuts off as far as possible it is also possible to residual forms small teat, for finishing Work is it is also possible to the machining such as be ground.But, in addition to such inlet residual trace portion 10, machinery can be omitted and add Work, arranges injection moulding face.

As being suitable for the injection molding thermoplastic resin composition of sealing ring S of the present invention, polyethersulfone resin can be lifted （PES resin）As a example constituent.It is not likely to produce so-called burr in injection-molded article, and then, have the following advantages, Coefficient of thermal expansion is relatively low, and the contractility after mould takes out is relatively low, and the size of sealing ring S is also maintained high accuracy, before can omitting The machining stated.

And, as shown in figure 3, using thermoplastic resin compositions such as polyethersulfone resin constituents, form gap 5 Global shape in opening-wide state, but from injection mold take out, gap 5 be in opening-wide state sealing ring S circle main body 1, The side contrary with gap 5 has radius of curvature R₁₃For maximum sized（Maximum sized）Position 13, and, be set to, from This maximum sized position 13 respectively to the 1st end 11, the 2nd end 12, with circumferential M₁、M₂Upper close, radius of curvature R₁、 R₂It is gradually reduced, the 1st end 11, the radius of curvature R of the 2nd end 12₁₁、R₁₂For minimum dimension, and then,（For less prominent chi Very little）1st protuberance 21, the radius of curvature of outer peripheral face of the 2nd protuberance 22 and aforementioned R₁₁、R₁₂Identical.

In addition, aforementioned radius of curvature R₁₃、R₁、R₂、R₁₁、R₁₂As shown in figure 3, being set to from central point O₁To outside circle main body 1 The size of side face.

And then, explanation, in the top view of Fig. 3, the circle main body 1 of opening-wide state are added to aforementioned maximum sized position 13 Point in the central authorities with respect to gap 5（Central point）P₅In the range of 180 ° ± 30 °, there is maximum sized position 13.That is, θ as shown in Figure 3 is 30 °, is equipped with maximum sized position 13 in the range of 2 θ=60 °.This maximum sized position 13 Angle select in the range of 1 °～60 °.（In addition, in figure 3, L₀It is to represent including central point P₅Diameter Line.）

So, the shape in the chamber of mould, size and, the sealing ring S that is taken out（With reference to Fig. 3）It is set to, its outer peripheral edge shape Shape is non-circular as follows, in ± the θ of the contrary side of 180 ° with respect to gap 5（=± 30 °）In the range of, arrange curvature Radius R₁₃For maximum sized position 13, it is gradually reduced towards gap 5 radius of curvature from this position 13.

In use state, it is assemblied in as illustrated in fig. 2 in the state of seal groove 4B, the 1st protuberance 21 and the 2nd protuberance 22 Overlap, in gap closure state, but be above-mentioned non-circular under the opening-wide state of gap, thus along with elastic deformation, In from central point O₁For same radius R₀Circular, the internal face 14 of the radial outside with respect to seal groove 4B as shown in Figure 2 It is in close contact.From gap opening-wide state（Fig. 3）To gap closure state（Fig. 7）During deformation, deformed so that maximum sized The maximum curvature radius at position 13 reduce, and the 1st end 11, the 2nd end 12 side hardly deform.Therefore, as shown in Figure 7 aforementioned Radius of curvature R₀Radius of curvature R with the end 11,12 shown in Fig. 3₁₁、R₁₂Equal.

The shape of cross section of circle main body 1 is rectangle.In the present invention, " rectangle " is defined as it is clear that including as shown in Figure 2 Square, rectangle, and then, also include a corner 15 as shown in Figure 11 from generally rectangular G with skewed straight line L₁₅Come The shape of chamfering, though and, omit diagram, include by the remaining corner beyond an above-mentioned corner 15 part or all Carry out the polygon of less chamfering, and, also include at least one of 4 corners of square or rectangular that there is small round corner Portion（Little ア Le portion）Shape.

In use state shown in Fig. 2, there is the 1st sliding contact surface 26 and the 2nd sliding contact surface 27, the aforementioned 1st is sliding Dynamic contact surface 26 with can dynamic vortex 7 back side 7A etc.（Drawer at movable side）Sealed plane P₁Sliding contact, aforementioned 2nd sliding contact Face 27 and internal face 14 grade of seal groove 4B（Affixed side）By sealing inner peripheral surface P₂Sliding contact.Be pushed into when pressurized by Sealed plane P of orthogonal shape₁, by sealing inner peripheral surface P₂The corner part 8 being formed.

But, the present invention adopts the thermoplastic resin compositions such as polyethersulfone resin constituent, thus has the following advantages, even if Cross section as shown in Fig. 2 etc. is set to square, rectangle（Omit chamfering）, there is not sealing ring S in eddying motion yet A corner 15 embed the medium rough sledding in gap 9 of back side 7A and planar portions 4A.But it is considered to pressure, temperature, motion speed The harsh situation of the use condition such as degree, operative orientation etc., the characteristic of fluid, also preferably forms the chamfering shown in Figure 11 etc. sometimes Portion 16.Explanation is added to the shape of cross section being arranged to chamfering 16, as shown in figure 11, generally rectangular from represented by double dot dash line G is by skewed straight line L₁₅One corner 15 is carried out chamfering.（In fig. 11 exemplified with C chamfering.）

Then, the 1st protuberance 21 and the 2nd protuberance 22 are in Figure 12, Figure 13（A）, Figure 14（A）, Figure 15, Figure 16（A）Shown embodiment In, it is to carry out two points of pentagon and triangle with skewed straight line.That is, the 1st protuberance 21 is to leave basic square shown in Figure 11 The pentagonal shape of cross section in 3 corners 17,18,19 of shape G, additionally, the 2nd protuberance 22 is the shape of cross section of triangle, There is skewed corresponding surface 23,24 to correspond to.

Additionally, as shown in figure 11, the shape of cross section of circle main body 1 is by skewed straight line L from generally rectangular G₁₅By one Corner 15 carries out the pentagonal situation of C chamfering, in Figure 13（B）, Figure 14（B）In shown embodiment, arrange in the 2nd protuberance 22 Become there is the trapezoidal of chamfered section 16.And, using its bottom surface as corresponding surface 24 so as to corresponding with the 1st protuberance 21 skewed Face 23 is relatively.In addition, in Figure 14（B）In, as shown by the solid line it is also possible to be arranged to corresponding surface 23,24 parallel with chamfered section 16, But it is preferably set to non-parallel as shown in double dot dash line in the figure.（Now the 2nd protuberance 22 is not trapezoidal.）

Then, in Figure 13（C）And Figure 14（C）In shown embodiment, the shape of the 1st protuberance 21 and already described Figure 13（B）, Figure 14 （B）Identical, but the 2nd protuberance 22 is arranged in the cross sectional shape that top has the triangle in roundlet corner 35.Additionally, with regard to correspondence Face 23,24, with already described Figure 13（B）, Figure 14（B）Identical.

Additionally, in Figure 14（D）Represent in shown embodiment, in Figure 14（C）The roundlet corner 35 of middle explanation can also become For arcuation recess 34.In addition, with Figure 14（D）Identical.In other words, with Figure 14（B）In there is chamfered section 16 phase of straight line Right, in Figure 14（C）（D）In, curvilinear chamfering is set.

Then, various embodiments, Figure 16 are represented in figure 16（A）Disclose again and already described Figure 14（A）Identical is transversal Face shape, Figure 16（B）Shape by the 1st protuberance 21 and the 2nd protuberance 22（Triangle）It is set to roughly the same.Additionally, in Figure 16 （A）（B）In, it is that right angled isosceles triangle is relative with the shape of cross section of the 2nd protuberance 22, such as Figure 16（C）（D）Shown, preferably Shape of cross section is set to scalene triangle.More than, Figure 16（A）（B）（C）（D）For corresponding surface 23,24（In cross section shape In shape）For straight line.

Additionally, in Figure 16（E）In shown embodiment, the shape of cross section of the 1st protuberance 21 is, by rectangle or square Notch 16A formed in a corner portion otch, the 2nd protuberance 22 is set to be embedded in rectangle or the pros of this notch 16A The shape of cross section of shape, the cross section of corresponding surface 23,24 is L-shaped.

Additionally, in Figure 16（F）In shown embodiment, the shape of cross section of the 1st protuberance 21 is, by a quarter round shape etc. Curve concavity notch 16B is formed in a corner portion otch, and the 2nd protuberance 22 is chimeric cross section at this notch 16B For the fan of a quarter semicircle shape etc., corresponding surface 23,24 is cross section is arc-shaped curve.

In addition, Figure 16（E）With（F）The shape of the shown notch of the centre of two embodiments is also free（Save sketch map Show）.And then, also there is following preferred situation, will be as Figure 14（C）Or（D）Shown roundlet corner 35, arcuation recess 34, in figure Formed at the right angle top of the 2nd protuberance 22 of 16 each embodiment.

And, as shown in Fig. 7～Figure 10, in the gap closure state that the 1st protuberance 21 and the 2nd protuberance 22 overlap, The each portion in cross section of the 1st protuberance 21 and the 2nd protuberance 22 is sized to the size public affairs without departing from G generally rectangular shown in Figure 11 Difference.

With respect to edge（Figure 12（A）Shown）Cut-off rule L₂₁Skewed corresponding surface 23 radial dimension H₂₃, axial chi Very little T₂₃（With reference to Figure 12（B））, will be along Figure 12（A）Shown cut-off rule L₂₁Skewed corresponding surface 24 radial dimension H₂₄、 Axial dimension T₂₄It is set as identical or slightly smaller.

That is, under the gap closure state that the 1st protuberance 21 and the 2nd protuberance 22 overlap, make the 1st protuberance of coincidence 21st, in the case that the sliding contact surface 26,27 of the 2nd protuberance 22 is consistent with generally rectangular G, the 1st protuberance 21 and the 2nd protuberance 22 are set Section shape and size（With reference to Figure 14, Figure 15, Figure 16）So that corresponding surface 23,24 mutual formation gaps.

In the present invention, can be manufactured by the injection moulding of thermoplastic resin composition, it is possible to by size Tolerance（Level with the chamber of mould）It is easily set at H₂₄≦H₂₃, T₂₄T₂₃.

Figure 17 or Figure 18 is, if being set to H₂₄＞ H₂₃, T₂₄＞ T₂₃In the case of produce rough sledding explanation Figure.I.e., in a state of use, sealing ring S is pressed into by sealed plane P₁With by sealing inner peripheral surface P₂The corner part 8 being formed, Now the 2nd protuberance 22 and two sides P₁、P₂It is in close contact, but the 1st protuberance 21 only certain one side abuts, and produces External leakage gap K₁、K₂, in arrow M₁₀、M₂₀Fluid leakage is produced on direction.

In the present invention, rough sledding as this Figure 17, Figure 18 to be prevented by the following method,（As previously mentioned）If Surely become H₂₄≦H₂₃, T₂₄T₂₃, the 1st protuberance 21 and the 2nd protuberance 22 are configured to, under the gap closure state overlapping, no Exceed from generally rectangular G, and, have gap at corresponding surface 23,24.

And then, as shown in figure 15 it is preferable that being set to the 1st protuberance 21 and the 2nd protuberance 22, in the basic square with Figure 11 Four sides of shape G overlap（Unanimously）In the case of, along cut-off rule L₂₁Corresponding two sides, i.e. the clearance ruler of corresponding surface 23 and corresponding surface 24 Very little ε is maximum, by its maximum gap size ε₀It is set to more than 10 μm and less than 100 μm.I.e., it is preferable to set become 10 μm of ε₀≦ 100μm.If exceeding higher limit, fluid leakage sharply increases.

So, be in gap closure state, and, the 1st protuberance 21 and the 2nd protuberance 22 be set to, with generally rectangular G Four sides overlap mode, along cut-off rule L₂₁Corresponding two sides 23,24 gap size ε be maximum in the state of, maximal clearance Size ε₀For more than 10 μm and less than 100 μm, it is possible to suppression is from the leakage on corresponding two sides 23,24, and, the 1st protuberance 21 and the 2nd protuberance 22 does not exceed from generally rectangular G, and sealing property also can improve further.

Return to Fig. 2 to illustrate, dynamic vortex 7 can carry out eddying motion, from this sliding contact surface 26,27 to object Part, I.e. sealed plane P₁, by sealing inner peripheral surface P₂Contact（Crimping）.And, such as knowable to Fig. 3～Figure 10, the 1st protuberance 21 and the 2nd Protuberance 22 also has joint face, is formed with sliding contact surface 26,27.

In the present invention, this sliding contact surface 26,27 is also（As previously mentioned）Omit the injection moulding face of machining As former state, the arithmetic average roughness and, by its surface being measured based on JIS B 0601（Ra）It is set as 0.1～2 so as to send out Wave excellent sealing property and mar proof.

Additionally, in the present invention, as should injection molding thermoplastic resin composition, crooked elastic rate is More than 1500MPa, below 6000MPa, for example, it is preferable to be polysulfones resin composition, specially polyether sulfone（PES）Resin Constituent, polysulfones（PSU）Resin combination, polyphenyl sulphonyl (PPSU, polyphenylsulfon) resin combination.Especially, Crooked elastic rate is preferably more than 2000MPa, below 4000MPa.

Additionally, as the polyethersulfone resin constituent of the sealing ring being relate suitable to the present invention, being that polyethersulfone resin is added Add the polyethersulfone resin constituent that powdered graphite etc. has compound and/or the fluororesin powder of layered crystal structure etc..By In adding in this wise, easily characteristic is adjusted to the scope of the above-mentioned elasticity of flexure, as the excellent in wear resistance of sealing ring, resistance to Heat, chemical resistance are also good, have enough extensibilities, and assembling and sealing are also good, are suitable for the air-conditioning illustrate in Fig. 1 With compressor etc..

In addition, as other thermoplastic resin compositions it is also possible to apply poly arylidene thio-ester resin composition, specifically, Poly-p-phenylene sulfide ether（PPS）Resin with the addition of above-mentioned powdered graphite etc. have layered crystal structure compound, fluororesin powder and/ Or the polyphenylene sulfide resin composition of the threadiness charges such as glass fibre, carbon fiber.

The present invention is, by thermoplastic resin composition, to form the circular overall shape that gap 5 is in opening-wide state Can be set to beyond shape, and, the inlet residual trace portion 10 of thermoplastic resin composition omit the injection moulding of machining Face, so be（From top view）There is no the shape at the position of coincidence, mould easily makes, and then, machining quilt（Almost complete Portion or whole）Omit, machining period can be reduced,（With conventional need cutting, compared with the preparation method of attrition process）Also reduce material Material loss, manufacturing cost also can reduce, and sealing, the sealing ring of excelling in abrasion resistance can keep stable high-quality, and And can produce in a large number.

The present invention, as described above, sealing ring possesses the circular global shape at the one of circumference with gap 5, has Circle main body 1 and the 1st protuberance 21, the 2nd protuberance 22, aforementioned 1st protuberance 21, the 2nd protuberance 22 by from the 1st end 11 of this circle main body 1, 2nd end 12 is circumferentially set up shape, and by thermoplastic resin composition, forming above-mentioned gap 5 is in open state The circular global shape of state, and, the above-mentioned circle main body 1 of above-mentioned opening-wide state is configured to, with respect to the central authorities in above-mentioned gap 5 Point P₅, in the range of 180 ° ± 30 °, there is radius of curvature R₁₃For maximum sized position 13, it is set to, from this full-size Position 13 be respectively facing above-mentioned 1st end 11, the 2nd end 12, with circumferential M₁、M₂Upper close, radius of curvature R₁、R₂Subtract Little, under the gap closure state that above-mentioned 1st protuberance 21 and the 2nd protuberance 22 overlap, global shape is in circular, so mould It is in opening-wide state that making is relatively easy to gap 5, is in circular under the use state that the 1st protuberance 21 and the 2nd protuberance 22 overlap, Play excellent sealing property with respect to circular inner periphery face（Sealing）.

Additionally, as thermoplastic resin composition, using crooked elastic rate be more than 1500MPa, the heat of below 6000MPa Plastic resin constituent, so having the extensibility of abundance, plays the elastic force being suitable for, the contact shape with object surface as sealing ring Condition is also excellent, sealing property（Sealing）Also more excellent.Further, it is possible to first will be also excellent to thermostability, chemical resistance, mar proof Different sealing ring is realized practical by injection moulding.

Additionally, by the arithmetic average roughness Ra on the surface of the sliding contact surface 26,27 to object Part be set to 0.1 with Above, less than 2, so further ensuring that excellent sealing property（Sealing）.

Additionally, the shape of cross section of above-mentioned circle main body 1 is rectangle, above-mentioned 1st protuberance 21 and the 2nd protuberance 22 are by above-mentioned circle The cross section of the rectangle of main body 1 cut-off rule L₂₁Two points of shape of cross section, above-mentioned 1st protuberance 21 and the 2nd protuberance 22 phase mutual respect Under the gap closure state closing, the corresponding surface 23,24 of above-mentioned 1st protuberance 21 and the 2nd protuberance 22 has gap each other, so using The arrow M of Figure 17 and Figure 18 explanation₁₀、M₂₀The leakage in direction substantially reduces.That is, the interface portion of the 1st protuberance 21 and the 2nd protuberance 22 The sealing of position can be improved.And, by the injection moulding of resin, can easily and inexpensively obtain the close of such shape Seal.

Description of reference numerals

1 circle main body

5 gaps

10 inlets residual trace portion

11 the 1st ends

12 the 2nd ends

13 radius of curvature are maximum sized position

15 1 corners

21 the 1st protuberances

22 the 2nd protuberances

23rd, 24 corresponding surface

26th, 27 sliding contact surface

ε gap size

ε₀Maximum gap size

G is generally rectangular

L₁₅Skewed straight line

L₂₁Cut-off rule

M₁、M₂Circumference

P₅Central point

R₁、R₂、R₁₃Radius of curvature

S sealing ring.

Claims

1. a kind of sealing ring, possesses and has gap at the one of circumference（5）Circular global shape, there is circle main body（1） With the 1st protuberance（21）, the 2nd protuberance（22）, aforementioned 1st protuberance（21）, the 2nd protuberance（22）By from this circle main body（1）The 1st end （11）, the 2nd end（12）In the circumferential extend shape set up it is characterised in that

By thermoplastic resin composition, form above-mentioned gap（5）Circular global shape in opening-wide state, and And, the above-mentioned circle main body of above-mentioned opening-wide state（1）It is configured to, with respect to above-mentioned gap（5）Central point（P₅）, 180 ° ± There is radius of curvature in the range of 30 °（R₁₃）For maximum sized position（13）, it is set to, from this maximum sized position（13） Respectively to above-mentioned 1st end（11）, the 2nd end（12）, with circumference（M₁）（M₂）Upper close, radius of curvature（R₁）（R₂）Subtract Little, in above-mentioned 1st protuberance（21）With the 2nd protuberance（22）Under the gap closure state overlapping, global shape is in circular.

2. sealing ring as claimed in claim 1 it is characterised in that

The crooked elastic rate of aforementioned thermoplastic resin constituent is more than 1500MPa, below 6000MPa.

3. sealing ring as claimed in claim 1 or 2 it is characterised in that

By the sliding contact surface to object Part（26）（27）Surface arithmetic average roughness（Ra）It is set to more than 0.1,2 Below.

4. sealing ring as claimed any one in claims 1 to 3 it is characterised in that

Above-mentioned circle main body（1）Shape of cross section be rectangle, above-mentioned 1st protuberance（21）With the 2nd protuberance（22）For by above-mentioned circle master Body（1）Rectangle cross section cut-off rule（L₂₁）Two points of shape of cross section,

In above-mentioned 1st protuberance（21）With the 2nd protuberance（22）Under the gap closure state overlapping, in above-mentioned 1st protuberance（21） With the 2nd protuberance（22）Corresponding surface（23）（24）There is gap each other.