CN206608548U - Sealing device - Google Patents

Abstract

The utility model provides sealing device.The number of parts of the sealing device is few, and specifically number of parts is less than three, and the densification thus, it is possible to realize sealing device possesses resistance to extrudability, and can suppress resistance to sliding low.The sealing device is made up of inner seal ring, outer seal ring and gasket ring, and outer seal ring is maintained in the retention groove set on the outer peripheral face of inner seal ring, and is slidably contacted with opposed faces, and gasket ring is configured in the inner circumferential side of inner seal ring.Inner seal ring possesses notch by rigidly high material is formed compared to outer seal ring, and on a position circumferentially.Outer seal ring by being formed compared to the inner seal ring low and low material of rigidity that rubs, and non junction formed.Gasket ring possesses the elasticity for pressing outer seal ring to opposed faces via inner seal ring by being formed compared to outer seal ring and the high material of inner seal ring elasticity.

Description

Sealing device

Technical field

The utility model is related to the sealing device on Sealing Technology.Sealing device of the present utility model is used for example as back and forth The piston seal of formula hydraulic cylinder or as sealing in other oil pressure units etc..

Background technology

In the past, for example filled as the sealing shown in (A) for having Figure 12 known to the piston seal of high pressure reciprocating hydraulic cylinder 51 are put, the sealing device 51 is arranged on the mounting groove for the ring-type that the outer peripheral face of piston is set, and passes through the inner circumferential with cylinder body Face is slideably in close contact between piston and cylinder to seal pressure oil of high pressure etc., and sealing device 51 is by sealing The combination of ring 52, gasket ring 53 and support ring 54,55 is constituted, wherein, the inner peripheral surface of sealing ring 52 and cylinder body slideably closely connects Touch, and be made up of PTFE, gasket ring 53 configure the inner circumferential side of sealing ring 52 and by bearing seal ring 52 ring-type convex portion 53a and Base portion 53b more broader than convex portion 53a is constituted, and the section of gasket ring 53 is convex form, is made up of NBR, and support ring 54,55 is with folder The mode for the convex portion 53a of sealing ring 52 and gasket ring 53 is configured, and is made up of a pair of polyamides.

The sealing device 51 of above-mentioned Figure 12 (A) can be with from the point of view of characteristic in the shape of each part, configuration and material etc. Play excellent sealing, but exist because therefore installing space is big more than number of parts and the problem of high cost of parts.

Therefore, in recent years, as shown in Figure 12 (B), by the sealing ring 62 of greater compactness of, inexpensive polyamide The sealing device 61 that combination with NBR gasket ring 63 is constituted starts popularization.

On the other hand, the piston seal of the groove shape of complexity is taken as, shown in such as Figure 12 (C), is developed by sealing The inner peripheral surface of the sealing device 71 that the combination of ring 72, gasket ring 73 and support ring 74,75 is constituted, sealing ring 72 and cylinder body is slideably It is in close contact, and is made up of PTFE, gasket ring 73 is configured in the inner circumferential side of sealing ring 72, its section is circle, is made up of NBR, props up Pushing out ring 74,75 is configured in the way of clipping sealing ring 72, is made up of a pair of polyamides, and the sealing device 71, which has to slide, to be hindered Power with Figure 12 (A) sealing device 51 or Figure 12 (B) sealing device 61 compared with low feature.

Compare the sealing device 61 of above-mentioned Figure 12 (B) and Figure 12 (C) sealing device 71, in order to mitigate cylinder apparatus Weight, the sealing device 61 of preferably compact Figure 12 (B), the sealing device 61 of (B) of the Figure 12 is from resistance to extrudability sight From the point of view of point, sliding surface is made up of the polyamide of high rigidity, the coefficient of friction of polyamide is high.Therefore, Figure 12 (B) sealing device 61 is compared with the sealing device 71 of Figure 12 (C), and resistance to sliding and slip heating are big, thus from sealing dress Put exist from the viewpoint of the life-span of (sealing system) (C) than Figure 12 sealing device 71 it is worse the problem of.

Currently, do not develop also while having compact design and low cunning as the sealing device 61 of Figure 12 (B) The sealing device of dynamic resistance (low friction).

Citation

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2005-221028 publications

Utility model content

Utility model problem to be solved

The utility model is in view of problem above, its object is to provide such as lower sealing device, the part of the sealing device Number is few, and specifically number of parts is less than three, and the densification thus, it is possible to realize sealing device possesses resistance to extrudability, And resistance to sliding can be suppressed low.

The means used to solve the problem

In order to achieve the above object, the sealing device of first method of the present utility model is arranged in mounting groove, the peace Tankage is arranged on the opposed of the inner circumferential side part in mutually opposing and relative movement inner circumferential side part and periphery sidepiece part On face, and the sealing device is slideably in close contact by the opposed faces with the periphery sidepiece part, thus described Suppress on high-tension side sealed object between the opposed faces of inner circumferential side part and the periphery sidepiece part to leak to low-pressure side, it is described close Seal apparatus is characterised by that the sealing device is made up of the combination of inner seal ring, outer seal ring and gasket ring, the interior sealing Ring is configured in the inner circumferential side of the opposed faces of the periphery sidepiece part, and the outer seal ring is maintained at the periphery of the inner seal ring In the retention groove set on face, and slidably contacted with the opposed faces of the periphery sidepiece part, the gasket ring configuration is in institute State the inner circumferential side of inner seal ring, the inner seal ring is by rigidly high material is formed compared to the outer seal ring, and circumferentially A position on possess notch, the outer seal ring compared to the inner seal ring by rubbing the low and low material shape of rigidity Into, and circumferentially formed, the gasket ring is by high compared to the outer seal ring and inner seal ring elasticity. non junction Material is formed, and possesses the bullet for pressing the outer seal ring to the opposed faces of the periphery sidepiece part via the inner seal ring Property.

In addition, the sealing device of second method of the present utility model is in the sealing device of above-mentioned first method, it is special Levy and be, the outer seal ring is formed by PTFE, polyurethane or rubber, the inner seal ring is formed by high-strength resin material, The gasket ring is formed by rubber or polyurethane.

In addition, the sealing device of Third Way of the present utility model is filled in the sealing of above-mentioned first method or second method In putting, it is characterised in that the notch is angular cut or step otch.

In addition, the sealing device of fourth way of the present utility model is in the sealing device of above-mentioned Third Way, it is special Levy and be, the angular cut is the combination with straight cut in the cut end.

The sealing device of the present utility model for possessing above-mentioned composition passes through the combination structure of inner seal ring, outer seal ring and gasket ring Into wherein inner seal ring configuration is in the inner circumferential side of the opposed faces of outer circumferential side part, and outer seal ring is maintained at the inner seal ring Outer peripheral face in the retention groove that sets, and slidably contacted with the opposed faces of periphery sidepiece part, the gasket ring configuration exists The inner circumferential side of the inner seal ring, thus, (A) of the number of parts than above-mentioned Figure 12 sealing device 51 and Figure 12 (C's) is close Four of seal apparatus 71 are few, are three.Further, since outer seal ring is held the retention groove set on the outer peripheral face of sealing ring In, and gasket ring configuration is in the inner circumferential side of inner seal ring, therefore these three parts are in the radially arranged side by side of sealing device.Separately Outside, because outer seal ring is maintained in the retention groove set on the outer peripheral face of inner seal ring, therefore two rings are in sealing device Radially overlap at least partially.Therefore, such number of parts is set to as little as three, by three parts close Side by side, the axial width of sealing device sets small the radial direction of seal apparatus, and inner seal ring and outer seal ring are in the footpath of sealing device Overlap at least partially upwards, thus the radial width of sealing device is also set to small, and therefore, sealing device is used as entirety Become compact.

Further, since the outer seal ring slidably contacted with the opposed faces of periphery sidepiece part is by low friction and low rigid Material shapes, therefore resistance to sliding is suppressed low.It is used as the material of outer seal ring, it is preferred to use PTFE, polyurethane or rubber.

In addition, when outer seal ring as above is shaped by low friction and low rigid material, exist the outer seal ring by In the worry extruded and damaged to the gap between inner circumferential side part and periphery sidepiece part, due in the utility model, as above Such outer seal ring is stated to be maintained in the retention groove set on the outer peripheral face of inner seal ring, therefore outer seal ring will not be to inner circumferential Gap extrusion between sidepiece part and periphery sidepiece part.On the other hand, because inner seal ring is shaped by the material of high rigidity, because This inner seal ring will not also be extruded to the gap between inner circumferential side part and periphery sidepiece part.As the material of inner seal ring, It is preferred to use high-strength resin material.

In addition, when inner seal ring as above is shaped by the material of high rigidity, worrying the gasket ring configured in its inner circumferential side Elasticity will not be to outer peripheral side outer seal ring transmission, thus gasket ring the opposed faces of outer seal ring part to outer peripheral side will not be pressed Pressure, but in the utility model, a position of the inner seal ring on its circumference possesses notch, therefore energy as described above It is enough to transmit the elasticity of gasket ring to outer seal ring.It is used as the material of gasket ring, it is preferred to use rubber or polyurethane.

Notch is the shape for having cut off a position of the inner seal ring on its circumference, and thus inner seal ring can be Radially greatly elastic deformation.The shape of notch is not particularly limited, it is preferred that ring to be set as to the shape of angular cutouts Angular cut, ring is set as to step otch of shape of stepped otch etc..

But, on angular cut, due to being the shape by ring relative to circumferencial direction obliquely otch, therefore its cut ends The top in portion turns into the tip of the angle smaller than right angle, and worry is easy to be damaged because of thin.Therefore, in order to tackle such a situation, Consider the angular cut in inner seal ring being set to the combination with straight cut, in this case, cut end in its cut end Top be set as the radial thickness of straight cut, therefore, it is possible to the intensity on the top for increasing cut end.Straight cut is that ring exists The shape of otch in plane comprising its center axis.

Utility model effect

The utility model produces following effect.

I.e., such as in the utility model as explained above, the number of parts of sealing device is set to as little as three, three The axial width of sealing device side by side, is thus set to small, inner seal ring and external seal by radial direction of the individual part along sealing device Ring radially overlaps at least partially sealing device, thus the radial width of sealing device be also set to it is small, therefore Sealing device overall compact.Further, since the outer seal ring slidably contacted with the opposed faces of periphery sidepiece part by low friction and Low rigid material shaping, therefore resistance to sliding is suppressed low.Further, since outer seal ring is maintained at the outer of inner seal ring In the retention groove set on side face, therefore outer seal ring will not be extruded to the gap between inner circumferential side part and periphery sidepiece part, Inner seal ring is shaped by the material of high rigidity, therefore inner seal ring also will not be between inner circumferential side part and periphery sidepiece part Gap is extruded, and can suppress to cause the breakage of sealing ring due to extrusion.Therefore, according to the above, such as the utility model institute's phase The purpose of prestige is such, using the teaching of the invention it is possible to provide number of parts is few, can realize the densification of sealing device, possesses resistance to extrudability, Er Qieneng Enough sealing devices that resistance to sliding is suppressed low.In addition, as the construction of notch, by by angular cut its end with it is straight Notch combinations, can increase the intensity on cut end top.

Brief description of the drawings

Fig. 1 is the main portion sectional view for the sealing device that embodiment of the present utility model is related to；

Fig. 2 is the figure for the first case for showing the notch that the sealing device possesses, and Fig. 2 (A) is the one of sealing device The front view of partial cut, Fig. 2 (B) is the side view of sealing device；

Fig. 3 is the figure for the operating state for showing the notch, and Fig. 3 (A) is the side view of sealing device, and Fig. 3 (B) is The C portion enlarged drawing of Fig. 3 (A)；

Fig. 4 is the figure for the second case for showing the notch that the sealing device possesses, and Fig. 4 (A) is the one of sealing device The front view of partial cut, Fig. 4 (B) is the side view of sealing device；

Fig. 5 is the figure for the operating state for showing the notch, and Fig. 5 (A) is the front view of sealing device, and Fig. 5 (B) is The F magnified partial views of Fig. 5 (A)；

Fig. 6 is the figure of the 3rd for showing the notch that the sealing device possesses, and Fig. 6 (A) is the one of sealing device The front view of partial cut, Fig. 6 (B) is the side view of sealing device；

Fig. 7 is the figure of the 4th for showing the notch that the sealing device possesses, and Fig. 7 (A) is the one of sealing device The front view of partial cut, Fig. 7 (B) is the side view of sealing device；

Fig. 8 is the shape explanation figure of the notch；

Fig. 9 is the figure of the 5th for showing the notch that the sealing device possesses, and Fig. 9 (A) is the one of sealing device The front view of partial cut, Fig. 9 (B) is the side view of sealing device；

Figure 10 is the chart for the result for showing the comparative test on resistance to sliding；

Figure 11 is the chart for the result for showing the comparative test on sliding heating；

Figure 12 (A) is the main portion sectional view of the sealing device on conventional example, and Figure 12 (B) and (C) is respectively Main portion sectional view on the sealing device of other conventional examples.

Symbol description

1 sealing device

11 inner seal rings

12 notch

12a, 12b cut end

13 retention grooves

14 inclined planes

15 straight cuts

21 outer seal rings

31 gasket rings

32 chamfered sections

41 pistons (inner circumferential side part)

42 mounting grooves

43 cylinder bodies (periphery sidepiece part)

44 gaps

Embodiment

Following embodiment is included in the utility model.

(1) sealing device of the present utility model is the combination sealing being made up of inner seal ring, outer seal ring and gasket ring.It is interior close Seal ring possesses the function as support ring of suppressing extrusion under elevated pressure conditions, by polyamide, polyacetal resin, polyethylene High-strength resin material (the tensile strength such as resin, polyimide resin, PEEK：More than 40MPa) constitute.It is arranged on sliding part Outer seal ring in order to ensure low resistance to sliding, there is low friction, low rigid material by the material relative to inner seal ring (PTFE, polyurethane, rubber etc.) is constituted.Gasket ring possesses function (the holding surface pressure for making outer seal ring be expanded in periphery sliding surface The function of power), it is made up of flexible rubber, polyurethane etc..In addition, inner seal ring considers the installation to groove, preferably exist The notch being made up of angular cut or step otch etc. is set on a position on circumference.

(2) it is low by being embedded to PTFE or polyurethane etc. on the outer peripheral face of high intensity but the high inner seal ring of coefficient of friction The outer seal ring of coefficient of friction, suppresses low by the coefficient of friction for sealing overall, reduction resistance to sliding, slip heating.Pass through The reduction of heating is slided, the life-span of filler used at the same time in cylinder body can be extended.Outer seal ring is due to being clipped in high intensity In sealing ring, thus it is damaged even if can also suppress extrusion under elevated pressure conditions.Sealedly it is sized to and Figure 12 (B) Sealing device 61 is identical, compared with the sealing device 71 of the sealing device 51 of Figure 12 (A) or Figure 12 (C) realize it is compact Change.The constituent part number of the sealing device 51 of Figure 12 (A) or Figure 12 (C) sealing device 71 is four, and this practicality is new Type is as little as three, therefore, it is possible to expect cost degradation.

(3) sealing device of the present utility model is following combination sealing, it is characterised in that on the circumference of inner seal ring A position set notch, jointless outer seal ring is embedded on its outer peripheral face, and pad is assembled with its inner circumferential side Ring.

(4) material on each part, jointless outer seal ring preferably application can easily elongate the PTFE of assembling, gather Urethane or rubber etc., especially preferably use the excellent PTFE of frictional behavior.There is provided the inner seal ring of notch is due to possessing Suppress the damaged support ring function of outer seal ring extrusion when high pressure is acted on, therefore preferably use the high intensity tree such as polyamide Fat material.Jointless gasket ring preferably uses rubber or poly- ammonia due to possessing the function on sliding surface by junk ring The elastomers such as ester.

(5) as the notch being arranged on inner seal ring, especially when using angular cut when, even if in use due to Heat influence and girth extend, also due to beveling oral area swash each other, notch will not be collided, and will not produce rupture.Thus, it is possible to It is zero enough to make the external diameter magnitude of interference.Thereby, it is possible to reduce the assembling load and reduction resistance to sliding to cylinder body.

(6) when beveling oral area swashes, because following mechanism suppresses the formation of leakage paths, sealing function is maintained.

(6-1) even if the outer circumferential side beveling oral area top of inner seal ring is swashed, also due to jointless outer seal ring and do not have There are leakage paths.

(6-2) is even if the inner circumferential side beveling oral area top of inner seal ring is swashed, also due to the expansive force of gasket ring and notch Top reduces leakage paths in fusion deformation.

(6-3) swashes even if the side of inner seal ring chamfers oral area top, the leakage road also not connected in the axial direction Footpath.

(7) by, using low-friction materials such as PTFE, can further be reduced sealedly in jointless outer seal ring Resistance to sliding.

(8) when the kerf of angular cut is from axially inner seal ring from a side, the oblique line of visual confirmation otch is cut In the case of mouth-shaped, when oblique line is straight line, the notch top of outer circumferential side is thinning, with other positions pair on circumference Than rigidity reduction.Therefore, under elevated pressure conditions in the case of use, worry that easily generation extrusion is (laterally wrong in notch top Position).When producing extrusion in the notch of inner seal ring, outer seal ring also produces extrusion, worries because extrusion causes letting out for breakage Leakage.

(9) here, in order to tackle such a situation, on the kerf of inner seal ring, the position of outer seal ring will be stored Straight cut is set to, the inner circumferential side of outer seal ring is set to angular cut (angular cutouts).

(10) by the way that the position of the storage outer seal ring of inner seal ring is set as into straight cut, outer circumferential side notch top Rigidity is improved.Extrusion thus, it is possible to suppress inner seal ring.

Embodiment

Then, embodiment of the present utility model is illustrated referring to the drawings.

Fig. 1 shows the major part section for the sealing device 1 that embodiment of the present utility model is related to.What the embodiment was related to Sealing device 1 is following sealing device (piston seal), and the sealing device is arranged on the mounting groove 42 of ring-type, mounting groove 42 be arranged on it is mutually opposing and relatively move reciprocating hydraulic cylinder in piston (inner circumferential side part) 41 and cylinder body (cylinder body pipe, Periphery sidepiece part) piston 41 in 43 opposed faces (outer peripheral face) on, and the opposed faces of the sealing device and cylinder body 43 are (interior Side face) slideably it is in close contact, thus suppress on high-tension side sealed object (pressure between the opposed faces of piston 41 and cylinder body 43 Power oil etc.) leaked to low-pressure side, as its constituent part, combined by inner seal ring 11, outer seal ring 21 and gasket ring 31, outside Sealing ring 21 configures the outer circumferential side in inner seal ring 11 and between inner seal ring 11 and cylinder body 43, gasket ring 31 is configured in interior sealing The inner circumferential side of ring 11, and between inner seal ring 11 and the trench bottom of mounting groove 42.

Wherein, inner seal ring 11 is shaped by the material high compared to the rigidity of outer seal ring 21, specifically by polyamide resin High-strength resin material (the tensile strength such as fat, polyacetal resin, polyvinyl resin, polyimide resin, PEEK：40MPa with On) shaping, be formed as size of the opposed faces relative to cylinder body 43 without the external diameter magnitude of interference, with cause inner seal ring 11 not with The opposed faces contact of cylinder body 43, sets defined radial clearance, i.e. outside it between the opposed faces of inner seal ring 11 and cylinder body 43 Footpath be dimensioned so as to it is more smaller than the internal diameter size of cylinder body 43, in addition, as shown in Fig. 2 inner seal ring 11 is formed as circumferentially The shape of one position cut-out, a position on the circumference possesses notch 12.In addition, the inner seal ring 11 is formed as axle It is rectangular shape to long section, the axial central portion of its outer peripheral face is provided with the retention groove 13 of ring-type, in outer peripheral face Axial both ends be respectively arranged with the ring-type of direction that outside dimension slowly reduces from from axial central portion to axial end portion and incline Inclined-plane 14.It will be described later for above-mentioned notch 12.

The material shaping that outer seal ring 21 rubs low and rigidly low compared with inner seal ring 11, specifically by PTFE (TFE), polyurethane or rubber molding, are fitted in the retention groove 13 for be arranged on the outer peripheral face of inner seal ring 11 simultaneously Kept by inner seal ring 11, outer seal ring 21 is formed as the size being slideably in close contact with the opposed faces of cylinder body 43, will Its outside dimension is set to more bigger than the internal diameter size of cylinder body 43, and is formed as the non junction shape on circumference without notch. In addition, the section that the outer seal ring 21 is formed as axially length is rectangular shape, it is contained in above-mentioned retention groove 13.In addition, The inner peripheral portion in addition to its peripheral part of the outer seal ring 21 is contained in above-mentioned retention groove 13, therefore inner seal ring 11 and outer close Seal ring 21 overlaps in a part for its radial direction.

In addition, gasket ring 31 compared to inner seal ring 11 and the high material of the elasticity of outer seal ring 21 by shaping, specifically by Rubber is polyurethane formed, possesses the elasticity for pressing outer seal ring 21 to the opposed faces of cylinder body 43 via inner seal ring 11, Its internal diameter size is set as that the outside dimension of the trench bottom than mounting groove 42 is smaller, in addition, being formed as on circumference without cutting The non junction shape of oral area.In addition, the section that the gasket ring 31 is formed as radially length is rectangular shape, its axial width is set Must be more smaller than the axial width of inner seal ring 11, in addition, the axial both ends of inner circumferential surface are respectively arranged with chamfered section 32.

As shown in Fig. 2 above-mentioned notch 12 is formed as inner seal ring 11 a position angular cutouts on its circumference Shape angular cut, in more detail, its cut sides is on the outer peripheral face position and inner peripheral surface position of inner seal ring 11 to circumference Direction shift (Fig. 2 (B)), inner seal ring 11 an axial end face area and another end face area not to circumference side To displacement (Fig. 2 (A)), and inclined plane of cut sides.Therefore, a pair of notches end 12a, 12b are in close inside The state that the radial direction of seal ring 11 posture one arranged side by side is swashed with another one.

In possessing the sealing device 1 of above-mentioned composition, the number of parts of sealing device 1 is by inner seal ring 11, external seal Constitute three of ring 21 and gasket ring 31, three parts radially side by side the axial width of a row thus sealing device 1 be set to it is small, Inner seal ring 11 and outer seal ring 21 are overlapped in a part for radial direction, and thus the radial width of sealing device 1 is also set to It is small, therefore the overall compact of sealing device 1.In addition, being rubbed with the outer seal ring 21 that the opposed faces of cylinder body 43 are slidably contacted with by low Wipe and low rigid material shaping, therefore resistance to sliding is suppressed low.In addition, outer seal ring 21 is held sealing ring 11 In the retention groove 13 set on outer peripheral face, therefore outer seal ring 21 will not be expressed into the gap 44 between piston 41 and cylinder body 43, Between inner seal ring 11 is shaped by the material of high rigidity, therefore inner seal ring 11 will not be also expressed between piston 41 and cylinder body 43 Gap 44, can suppress due to the breakage of sealing ring 11,21 caused by extrusion.Therefore, according to case above, using the teaching of the invention it is possible to provide sealing Device 1, its number of parts is few, can realize the densification of sealing device 1, and possesses resistance to extrudability, and can be hindered sliding Power suppresses low.

In addition, in possessing the sealing device 1 of above-mentioned composition, possessing and being made up of high-strength resin materials such as polyamides Inner seal ring 11, but be due to that the inner seal ring 11 is formed as the opposed faces of opposing cylinder 43 without the big of the external diameter magnitude of interference It is small, therefore inner seal ring 11 will not become the resistance key element when being assembled into cylinder body 43, alternatively as the outer close of resistance key element Seal ring 21 is easier occur elastic deformation due to being made up of PTFE, polyurethane or rubber, and drag loading is small.Accordingly, it is capable to Enough reductions can easily carry out assembly working to the assembling load of cylinder body 43.

In addition, the notch 12 that a position on the circumference of inner seal ring 11 is set is without respect to sealing ring circumference Direction step otch at a right angle, but relative to the inclined angular cut of sealing ring circumferencial direction, even if therefore inner seal ring 11 Affected by the heat flexible to circumferencial direction, cut end 12a, 12b also mutually maintains the state swashed, cut end 12a, Gap is not produced between 12b.It is expressed into therefore, it is possible to suppress outer seal ring 21 or gasket ring 31 between cut end 12a, 12b Gap (not shown) and it is damaged.

In addition, the girth in inner seal ring 11 is changed due to heat etc., between cut end 12a, 12b of beveling mutually During displacement, suppress the formation of leakage paths due to following mechanism.That is, as shown in Fig. 3 D parts, even if the periphery of beveling Lateral incision end 12a is highlightedly shifted outward relative to inner circumferential side cut end 12b to footpath, due in outer circumferential side cut end There is outer seal ring 21 in 12a more outer circumferential side, therefore will not form leakage paths.In addition, as shown in Fig. 3 E parts, even if tiltedly Relative to outer circumferential side cut end 12a, to footpath, inwardly side is highlightedly shifted the inner circumferential side cut end 12b of otch, also due to gasket ring 31 expansive force, inner circumferential side cut end 12b can reduce leakage paths in fusion deformation.Therefore, such structure is passed through Make and be able to maintain that sufficient sealing function.

In addition, the angular cut in the notch 12 of above-mentioned inner seal ring 11 can also be following such construction.

The second case of notch

In the second case shown in Fig. 4 and Fig. 5, the angular cut in notch 12 is set to its cut sides in inner seal ring 11 Axially end face area and another end face area shift (Fig. 4 (A)) to circumferencial direction, in the periphery of inner seal ring 11 Facial position and inner peripheral surface position do not shift (Fig. 4 (B)) to circumferencial direction, and cut sides are set to inclined plane.Therefore, A pair of notches end 12a, 12b are in the state for another one of being swashed in the axial direction of inner seal ring 11 posture one arranged side by side.At this In the case of kind, as shown in Fig. 5 G parts, even if a cut end of angular cut relative to another cut end to axial direction Highlightedly shift, the leakage stream that (insertion) is connected on axial direction is also not formed in, thus, it is possible to maintain sufficient sealing function.

The 3rd of notch

In the 3rd shown in Fig. 6, the angular cut of notch 12 is set to its cut sides in the axial direction of inner seal ring 11 One end face area and another end face area shift (Fig. 6 (A)) to circumferencial direction, at the outer peripheral face position of inner seal ring 11 Also shifted (Fig. 6 (B)) to circumferencial direction with inner peripheral surface position, and cut sides be set to it is inclined plane.Therefore, a pair Cut end 12a, 12b be in axially and radially both relative to inner seal ring 11 in tilted direction posture one arranged side by side Climb the state of another one.In this case, even if the inclination outer circumferential side cut end 12a of angular cut is relative to inclination inner circumferential side Cut end 12b is highlightedly shifted outward to footpath, also due to the more outer circumferential side for tilting outer circumferential side cut end 12a exist it is outer close Seal ring 21, therefore leakage stream will not be formed.Even if in addition, the inclination inner circumferential side cut end 12b of angular cut is relative to inclination To footpath, inwardly side is highlightedly shifted outer circumferential side cut end 12a, also due to the expansive force of gasket ring 31, tilts inner circumferential side cut end 12b can reduce leakage paths in fusion deformation.Even if in addition, a cut end of angular cut is relative to another Cut end is shifted to axially projecting, will not also form the leakage paths for connecting (insertion) in the axial direction.Therefore, the structure is passed through Make and be able to maintain that sufficient sealing function.

The 4th of notch

In addition, the angular cut in notch 12 be as described above by inner seal ring 11 circumferencial direction angular cutouts otch Portion, therefore the top of its cut end 12a, 12b is the tip of the angle less than right angle, the thin easy breakage in tip.Therefore, in order to Tackle such case, it is considered to which angular cut is set to the combination with straight cut 15 in its cut end 12a, 12b, such case, by In the top in cut end 12a, 12b set with the corresponding thickness of straight cut 15, therefore, it is possible to increase cut end 12a, The intensity on 12b top.The inward-facing sealing ring of otch of straight cut 15 radially extends setting.

The example as shows combine angular cut with straight cut 15 the 4th in Fig. 7 and Fig. 8, is set to it and cuts Mouth face shifts (Fig. 7 (B)) on the outer peripheral face position and inner peripheral surface position of inner seal ring 11 to circumferencial direction, in inner seal ring A 11 axially end face area and another end face area does not shift (Fig. 7 (A)) to circumferencial direction, and cut sides are set to oblique The position of the clinoplain shape of the inner circumferential side of otch 12 and the setting that radially extends by straight cut 15 along inner seal ring 11 The combination at the position of the right-angle plane shape of outer circumferential side.Therefore, by the construction, outer circumferential side cut end 12a top is set Intensity for the thickness of the radial direction of straight cut 15, therefore top increases, and can suppress the damaged generation such as crackle or breach.Separately Outside, the radial width on straight cut 15, is preferably set to the degree equal with the groove depth of retention groove 13.

The 5th of notch

In addition, the notch 12 of inner seal ring 11 is in addition to above-mentioned angular cut or step otch.Step otch For example as shown in figure 9, be in step-like otch by a position of the inner seal ring 11 on its circumference shape, and be relative In orthogonal the first plane face 12c of sealing ring circumferencial direction, plane parallel relative to sealing ring circumferencial direction Two face 12d and the plane threeth face 12e orthogonal relative to sealing ring circumferencial direction are arranged side by side on sealing ring axial direction, by this Three faces 12c, 12d, 12e have cut off the shape of inner seal ring 11.

In addition, present inventor is by the sealing device 1 of above-described embodiment (Fig. 9) and the sealing device of Figure 12 (A) The sealing device 61 of 51 and Figure 12 (B) has carried out on resistance to sliding and slided the comparative test of heating, therefore as sample Illustrate its experimental method and result of the test below.

(1) comparative test on resistance to sliding

Test method：

The resistance to sliding produced in each sample is determined under the following conditions.

Cylinder body footpath：

Sliding speed：100mm/s

Temperature：100℃

Oil is planted：Engine oil SAE10W

Result of the test：

(1 point of result of the test such as Figure 10 chart：Sealing device 51, the △ points of Figure 12 (A)：The sealing of Figure 12 (B) Device 61, ◇ points：The sealing device 1 of embodiment) shown in, according to the sealing device 1 of embodiment, the sealing with Figure 12 (A) is filled Put 51 to compare with the sealing device 61 of Figure 12 (B), be able to confirm that the resistance to sliding reduction of generation.

(2) on sliding the comparative test generated heat

Test method：

The slip heating produced in each sample is determined under the following conditions.

Cylinder body footpath：

Pressure：10MPa

Sliding speed：50mm/s

Temperature：Naturally heat up

Result of the test：

Heating is slided to show to start to reach temperature when rear-bank rotor housing surface temperature slowly rises saturation in slip.Result of the test Such as Figure 11 chart (sample a：Sealing device 51, the sample b of Figure 12 (A)：Sealing device 61, the sample c of Figure 12 (B)：It is real Apply the sealing device 1 of example) shown in, according to the sealing device 1 of embodiment, sealing device 51 and Figure 12 (B) with Figure 12 (A) Sealing device 61 compare, be able to confirm that generation slip heating reduction.

In addition, in the above-described embodiments, the otch such as angular cut or step otch is set on a position circumferentially The inner seal ring 11 in portion 12, forms it into size of the opposed faces relative to cylinder body 43 without the external diameter magnitude of interference, to cause Inner seal ring 11 does not contact with the opposed faces of cylinder body 43 and sets defined between the opposed faces of inner seal ring 11 and cylinder body 43 Radial clearance, i.e. be set to its outside dimension more smaller than the internal diameter size of cylinder body 43, but the inner seal ring 11 can also be relative Contacted in the opposed faces of cylinder body 43, the opposed faces be formed as relative to cylinder body 43 carry the size of the external diameter magnitude of interference, i.e., can also By its outside dimension be set as with the internal diameter size of cylinder body 43 it is equal or equal more than size.In this case, external seal Ring 21 is contacted with the opposed faces of cylinder body 43, and opposed faces of the inner seal ring 11 also with cylinder body 43 are contacted in addition.

Claims (3)

1. a kind of sealing device, the sealing device is arranged in mounting groove, the mounting groove is arranged on mutually opposing and relative In the opposed faces of the inner circumferential side part in mobile inner circumferential side part and periphery sidepiece part, and the sealing device passes through Slideably it is in close contact with the opposed faces of the periphery sidepiece part, thus in the inner circumferential side part and the periphery sidepiece part Opposed faces between suppress on high-tension side sealed object and leaked to low-pressure side, the sealing device is characterised by,

The sealing device is made up of the combination of inner seal ring, outer seal ring and gasket ring, and the inner seal ring configuration is described The inner circumferential side of the opposed faces of periphery sidepiece part, the outer seal ring is maintained at the guarantor set on the outer peripheral face of the inner seal ring Hold in groove, and slidably contacted with the opposed faces of the periphery sidepiece part, the gasket ring configuration is in the inner seal ring Inner circumferential side,

The inner seal ring possesses by compared to the outer seal ring, rigidly high material is formed, and on a position circumferentially Notch,

The outer seal ring compared to the inner seal ring low and low material of rigidity that rubs by forming, and circumferentially non junction Ground is formed,

The gasket ring is possessed via described interior by being formed compared to the outer seal ring and the high material of inner seal ring elasticity The elasticity that sealing ring presses the outer seal ring to the opposed faces of the periphery sidepiece part.

2. sealing device according to claim 1, it is characterised in that

The notch is angular cut or step otch.

3. sealing device according to claim 2, it is characterised in that

The angular cut is the combination with straight cut in the cut end.