WO2016113923A1 - シールリング及び密封構造 - Google Patents
シールリング及び密封構造 Download PDFInfo
- Publication number
- WO2016113923A1 WO2016113923A1 PCT/JP2015/067556 JP2015067556W WO2016113923A1 WO 2016113923 A1 WO2016113923 A1 WO 2016113923A1 JP 2015067556 W JP2015067556 W JP 2015067556W WO 2016113923 A1 WO2016113923 A1 WO 2016113923A1
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- WO
- WIPO (PCT)
- Prior art keywords
- seal ring
- peripheral surface
- shaft
- thin
- annular groove
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/441—Free-space packings with floating ring
Definitions
- the present invention relates to a seal ring and a sealing structure for sealing an annular gap between a shaft and a shaft hole of a housing.
- a seal ring that is mounted in an annular groove provided on the outer peripheral surface side of the shaft and seals the annular clearance between the shaft and the housing. Is provided.
- a shaft in which a seal ring is previously mounted in an annular groove is inserted into a shaft hole provided in the housing.
- FIG. 9 is an explanatory diagram of an operation for inserting a shaft through a housing in the prior art.
- the shaft 200 in which the seal ring 500 is previously mounted in the annular groove 210 is inserted into the shaft hole 310 provided in the housing 300 in the arrow X direction in the drawing.
- the seal ring 500 protrudes downward from the outer peripheral surface of the shaft 200 due to its own weight, the lower portion Y of the seal ring 500 hits the front end of the housing 300, so that the portion Y is damaged.
- the seal ring 500 protrudes downward from the outer peripheral surface of the shaft 200 due to its own weight
- the seal ring 500 is configured to exert a sealing function by being in close contact with the side wall surface of the annular groove 210 and the inner peripheral surface of the shaft hole 310. Therefore, a gap is formed between the inner peripheral surface of the seal ring 500 and the groove bottom of the annular groove 210.
- the seal ring 500 is suspended in the annular groove 210 due to its own weight, and the center axis CS of the seal ring 500 is downward with respect to the center axis C of the shaft 200. To position. Therefore, the seal ring 500 protrudes downward from the outer peripheral surface of the shaft 200.
- a dotted line in FIG. 9 indicates the position of the seal ring 500 when the center axis CS of the seal ring 500 is coincident with the center axis C of the shaft 200.
- the distance between the center axis C of the shaft 200 and the center axis CS of the seal ring 500 during the above operation is the size of the gap between the inner peripheral surface of the seal ring 500 and the groove bottom of the annular groove 210.
- the corners 213 at both ends of the groove bottom of the annular groove 210 are formed by curved surfaces that connect the groove bottom 212 and the groove side surface (side wall surface 211) of the annular groove 210 for reasons such as manufacturing. May be configured.
- FIG. 10 is a schematic cross-sectional view of a sealing structure including a seal ring 500X according to a conventional example.
- the seal ring 500 exhibits a sealing function by being in close contact with the side wall surface 211 of the annular groove 210. Therefore, the seal ring 500 must be prevented from coming into contact with the corner portion 213 formed of a curved surface. Therefore, if the corner 213 formed by the curved surface is large, the gap between the inner peripheral surface of the seal ring 500 and the groove bottom 212 of the annular groove 210 must be widened.
- FIG. 11 is a schematic cross-sectional view of a sealing structure provided with a seal ring 500Y according to a conventional example.
- an abutment portion is often provided at one place in the circumferential direction.
- the abutment portion may have a complicated structure due to functional reasons. In such a case, the concave portion 510 as described above cannot be provided in the vicinity of the joint portion for reasons such as strength and manufacturing method.
- PTFE is preferably used in a portion where sealability is required.
- PTFE since it is relatively soft, the above problem of damage becomes more prominent.
- ATs and CVTs for automobiles it is possible to confirm that the seal ring is damaged by inspection after the AT and CVT are assembled, so it takes a lot of work to replace the seal ring. End up.
- An object of the present invention is to reduce the deviation of the center axis of the seal ring with respect to the center axis of the shaft during insertion of the shaft into the housing, thereby suppressing the seal ring from hitting the tip of the housing. And providing a sealing structure.
- the present invention employs the following means in order to solve the above problems.
- the seal ring of the present invention is A resin seal ring that is mounted in an annular groove provided on the outer peripheral surface side of the shaft and seals an annular gap between the shaft and the housing, The annular gap is sealed by being in close contact with the low-pressure side wall surface of the annular groove and the inner peripheral surface of the shaft hole through which the shaft of the housing is inserted, and at one place in the circumferential direction.
- a thin-walled portion having a thin radial thickness and a range of less than 180 ° with respect to the circumferential direction, and being configured to protrude radially inward from the inner peripheral surface of the thin-walled portion, And is composed of a thick part with a thicker radial thickness than the part,
- the joint part is provided in the thin part, Recesses for forming a gap with the corners at both ends of the annular groove are formed in the end portions on the inner peripheral surface sides of the both side surfaces of the thick portion, respectively. It is characterized by that.
- the sealing structure of the present invention is A shaft provided with an annular groove on the outer peripheral surface side; A housing having a shaft hole through which the shaft is inserted; The annular gap between the shaft and the housing is sealed at one place in the circumferential direction by closely contacting the low-pressure side wall surface of the annular groove and the inner peripheral surface of the shaft hole.
- a resin seal ring provided with a joint portion;
- the seal ring is A thin-walled portion having a thin radial thickness and a range of less than 180 ° with respect to the circumferential direction, and being configured to protrude radially inward from the inner peripheral surface of the thin-walled portion, And is composed of a thick part with a thicker radial thickness than the part,
- the joint part is provided in the thin part, Recesses for forming a gap with the corners at both ends of the annular groove are formed in the end portions on the inner peripheral surface sides of the both side surfaces of the thick portion, respectively. It is characterized by that.
- the seal ring includes a thin portion and a thick portion, and the thin portion is provided in a range of less than 180 ° with respect to the circumferential direction.
- the inner peripheral surface of the thick portion of the seal ring comes into contact with the groove bottom of the annular groove provided on the shaft.
- the recessed part for forming a clearance gap between the corner part of the groove bottom both ends is formed in the edge part of each inner peripheral surface side in the both sides
- the thickness of the thick portion is increased while maintaining the sealing performance. The shift of the center axis of the seal ring with respect to the center axis can be reduced.
- the abutment portion is provided in the thin portion, the structure of the abutment portion does not hinder the formation of the recess.
- the corners at both ends of the groove bottom of the annular groove are configured by curved surfaces that connect the groove bottom and the groove side surface of the annular groove
- the radius of curvature of the inner peripheral surface of the thin-walled portion is RA
- the radius of curvature of the inner peripheral surface of the thick-walled portion is RB
- the radius of curvature at the largest radial portion of the portion provided with the concave portion is RBX
- the curved surface If the half of the outer diameter at the largest portion in the radial direction among the corners constituted by RC is RC, and the half of the outer diameter at the groove bottom of the annular groove is RD, RA> RC, RBX>RC>RB> RD Any of these may be satisfied.
- the abutment portion is cut in a staircase shape when viewed from either the outer peripheral surface side or both side wall surfaces, so that a first fitting convex portion and a first one are formed on the outer peripheral surface side of one side through the cutting portion.
- a fitting recess is provided, and on the outer peripheral surface side of the other side, a second fitting recess that fits the first fitting convex and a second fitting convex that fits in the first fitting recess may be provided. .
- the concave portion may be formed by heat press processing.
- the seal ring when the shaft is inserted into the housing, the seal ring hits the front end of the housing by reducing the shift of the center axis of the seal ring with respect to the center axis of the shaft. Can be suppressed.
- FIG. 1 is a side view of a seal ring according to an embodiment of the present invention.
- FIG. 2 is a partially enlarged view of a side view of the seal ring according to the embodiment of the present invention.
- FIG. 3 is a partially enlarged view of a side view of the seal ring according to the embodiment of the present invention.
- FIG. 4 is a partially enlarged view of the view of the seal ring according to the embodiment of the present invention as viewed from the outer peripheral surface side.
- FIG. 5 is a partially enlarged view of the view of the seal ring according to the embodiment of the present invention as viewed from the inner peripheral surface side.
- FIG. 6 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention.
- FIG. 7 is a schematic cross-sectional view of a sealing structure according to an embodiment of the present invention.
- FIG. 8 is an explanatory view of the operation of inserting the shaft through the housing in the embodiment of the present invention.
- FIG. 9 is an explanatory diagram of an operation for inserting a shaft through a housing in the prior art.
- FIG. 10 is a schematic cross-sectional view of a sealing structure including a seal ring according to a conventional example.
- FIG. 11 is a schematic cross-sectional view of a sealing structure including a seal ring according to a conventional example.
- a seal ring and a sealing structure according to an embodiment of the present invention will be described with reference to FIGS.
- the seal ring and the sealing structure according to the present embodiment seal an annular gap between a relatively rotating shaft and a housing in order to maintain hydraulic pressure in a transmission such as an AT or CVT for automobiles. It is used for the purpose to do.
- “high pressure side” means a side that becomes high when differential pressure occurs on both sides of the seal ring
- “low pressure side” means that differential pressure occurs on both sides of the seal ring. This means the side that is at low pressure.
- FIG. 1 is a side view of a seal ring according to an embodiment of the present invention.
- FIG. 2 is a partially enlarged view of a side view of the seal ring according to the embodiment of the present invention, and is an enlarged view of a circled portion in FIG.
- FIG. 3 is a partially enlarged view of a side view of the seal ring according to the embodiment of the present invention, and is an enlarged view of the surface on the opposite side of the circled portion in FIG. FIG.
- FIG. 4 is a partially enlarged view of the seal ring according to the embodiment of the present invention as viewed from the outer peripheral surface side, and is a view of the circled portion in FIG. 1 as viewed from the outer peripheral surface side.
- FIG. 5 is a partially enlarged view of the seal ring according to the embodiment of the present invention as viewed from the inner peripheral surface side, and is a view of the circled portion in FIG. 1 as viewed from the inner peripheral surface side.
- the seal ring 100 is mounted in an annular groove 210 provided on the outer peripheral surface side of the shaft 200.
- the seal ring 100 seals an annular gap between the relatively rotating shaft 200 and the housing 300 (the inner peripheral surface of the shaft hole 310 through which the shaft 200 is inserted in the housing 300) (FIGS. 6 and 6). 7).
- the seal ring 100 maintains the fluid pressure in the seal target region configured so that the fluid pressure (hydraulic pressure in the present embodiment) changes.
- the fluid pressure in the region on the right side in FIGS. 6 and 7 is configured to change, and the seal ring 100 maintains the fluid pressure in the region to be sealed on the right side in FIGS.
- the seal ring 100 is composed of an annular member made of polytetrafluoroethylene (PTFE).
- An abutment portion 110 is provided at one place in the circumferential direction of the seal ring 100.
- the seal ring 100 is configured so as to protrude inward in the radial direction from the inner peripheral surface of the thin part 100A and the thin part 100A having a small radial thickness, thereby being more radial than the thin part 100A.
- the thick portion 100B is thick. Accordingly, when the seal ring 100 is viewed from the side, the outer peripheral surface is circular, whereas the inner peripheral surface is provided with a step in the radial direction.
- 100A and 100B in a figure have each shown the range in which a thin part is provided, and the range in which a thick part is provided.
- Said thin part 100A is provided in the range below 180 degrees with respect to the circumferential direction.
- the above-mentioned joint part 110 is provided in this thin part 100A.
- the recessed part 120 is each formed in the edge part of each inner peripheral surface side in the both sides
- the pair of recesses 120 is provided to form a gap between the corners 213 at both ends of the annular groove 210 (see FIG. 7).
- the recessed part 120 which concerns on a present Example is comprised so that a cross section may become a rectangle.
- the cross section of the thin portion 100A is rectangular (see FIG. 6), whereas the cross section of the thick portion 100B is T-shaped (see FIG. 7).
- the seal ring 100 can be obtained by molding with a mold.
- the joint portion 110 may be formed by molding or may be formed by cutting.
- the recess 120 is preferably formed by a heat press that pressurizes while heating (see JP 2012-11646 A). This eliminates the need for complicated machining by machining, and allows the recess 120 to be easily formed with less man-hours. Moreover, the dimensional accuracy of the part which forms the recessed part 120 can be raised, and the influence on the dimensional accuracy of the site
- the configuration of the abutment portion 110 according to the present embodiment will be described with reference to FIGS. 2 to 5 in particular.
- the joint part 110 according to the present embodiment employs a special step cut cut in a step shape when viewed from either the outer peripheral surface side or both side wall surfaces.
- the first fitting convex portion 111 and the first fitting concave portion 114 are provided on the outer peripheral surface side on one side via the cutting portion, and the outer peripheral surface side on the other side is provided.
- a second fitting concave portion 113 into which the first fitting convex portion 111 is fitted and a second fitting convex portion 112 to be fitted into the first fitting concave portion 114 are provided.
- the end surface 115 on the inner peripheral surface side on one side and the end surface 116 on the inner peripheral side on the other side face each other through the cutting portion. Since the special step cut is a known technique, a detailed description thereof is omitted, but it has a characteristic of maintaining a stable sealing performance even if the circumference of the seal ring 100 is changed due to thermal expansion and contraction.
- the “cutting portion” includes not only the case of being cut by cutting, but also the case of being obtained by molding.
- FIGS. 6 and 7 are schematic cross-sectional views of a sealing structure according to an embodiment of the present invention.
- a seal ring 100 in FIG. 6 is a cross-sectional view along AA in FIG. 2
- the seal ring 100 in FIG. 1 is a BB sectional view in FIG. 6 and 7 show a state in which the engine is started and the fluid pressure in the right region is higher than that in the left region via the seal ring 100.
- the seal ring 100 is in close contact with the side wall surface 211 on the low pressure side in the annular groove 210 and the inner peripheral surface of the shaft hole 310 in the housing 300, so that the space between the shaft 200 and the housing 300 is set. Seal the annular gap.
- the radius of curvature of the largest radial portion of the portion of the seal ring 100 where the recess 120 is provided is RBX
- the axial width of the recess 120 is HB.
- the annular groove 210 half of the outer diameter at the largest radial portion of the corner 213 formed by the curved surface is RC, the width of the corner 213 is HC, and the outer diameter is half of the groove bottom 212. Is RD.
- RA> RC, RBX> RC> RB> RD and HB> HC are all designed to be satisfied.
- RA> RC the side surface of the thin portion 100 ⁇ / b> A does not come into contact with the corner portion 213 in the annular groove 210.
- RBX> RC and HB> HC the side surface of the thick portion 100B does not contact the corner portion 213 of the annular groove 210. Therefore, the side surface of the seal ring 100 does not contact the corner portion 213 over the entire area. That is, the side surface of the seal ring 100 contacts the side wall surface 211 of the annular groove 210 over the entire area.
- RC> RB> RD the thickness of the thick portion 100B can be increased without the seal ring 100 coming into contact with the corner portion 213.
- FIG. 8 is an explanatory diagram of the operation of inserting the shaft through the housing in this embodiment.
- the shaft 200 in which the seal ring 100 is mounted in the annular groove 210 in advance is inserted into the shaft hole 310 provided in the housing 300 in the arrow X direction in the figure.
- the inner peripheral surface of the thick wall portion 100B is in contact with the groove bottom 212 of the annular groove 210. Therefore, during the insertion operation, the center axis C of the shaft 200 and the center axis CS of the seal ring 100 can be substantially matched.
- the seal ring 100 includes the thin portion 100A and the thick portion 100B, and the thin portion 100A is provided in a range of less than 180 ° with respect to the circumferential direction.
- the inner peripheral surface of the thick portion 100B of the seal ring 100 is in contact with the groove bottom 212 of the annular groove 210 provided on the shaft 200.
- the recessed part 120 for forming a clearance gap between the corner part 213 of the groove bottom both ends in the edge part of each inner peripheral surface side in the both sides
- the thickness of the thick portion 100B is increased while maintaining the sealing performance, whereby the shaft 200 to the housing 300 is increased. It is possible to reduce the deviation of the central axis CS of the seal ring 100 from the central axis C of the shaft 200 during the insertion operation. Thereby, it can suppress that the seal ring 100 protrudes below rather than the outer peripheral surface of the axis
- the abutment portion 110 since the abutment portion 110 is provided in the thin portion 100A, the structure of the abutment portion 110 does not hinder the formation of the recess 120. Therefore, even if a special step having a relatively complicated structure is employed as the abutment portion 110 as in the present embodiment, the formation of the recess 120 is not hindered.
- seal ring 100 is made of PTFE
- the material of the seal ring in the present invention is not limited to PTFE, and other resin materials can be used.
- it since it can suppress that a seal ring hits a housing and it is damaged, it is especially effective when a soft resin material is employ
- the joint portion in the present invention is not limited to the special step cut, and a joint portion of another structure can be adopted.
- the joint portion in the present invention since it is not necessary to form a concave portion in the joint portion, it is particularly effective when a joint portion having a complicated structure in which it is difficult to form the concave portion is employed.
- the recess 120 is configured to have a rectangular cross section.
- the shape of the recess in the present invention is not limited as long as a gap can be formed between the corners 213 at both ends of the annular groove 210.
- a recess may be formed. That is, you may comprise so that the cross section of a recessed part may become a triangle.
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Abstract
Description
軸の外周面側に設けられた環状溝に装着され、前記軸とハウジングとの間の環状隙間を封止する樹脂製のシールリングであって、
前記環状溝における低圧側の側壁面と、前記ハウジングにおける前記軸が挿通される軸孔の内周面とに対してそれぞれ密着することで、前記環状隙間を封止すると共に、周方向の1箇所には合口部が設けられているシールリングにおいて、
径方向の肉厚が薄く、周方向に対して180°未満の範囲で設けられる薄肉部と、該薄肉部の内周面よりも径方向内側に突出するように構成されることで、該薄肉部よりも径方向の肉厚が厚い厚肉部とから構成されると共に、
前記合口部は前記薄肉部に設けられ、
前記厚肉部の両側面における各内周面側の端部には、前記環状溝の溝底両端の隅部との間で隙間を形成させるための凹部が全域に亘ってそれぞれ形成されていることを特徴とする。
外周面側に環状溝が設けられた軸と、
該軸が挿通される軸孔を有するハウジングと、
前記環状溝における低圧側の側壁面と、前記軸孔の内周面とに対してそれぞれ密着することで、前記軸とハウジングとの間の環状隙間を封止すると共に、周方向の1箇所に合口部が設けられた樹脂製のシールリングと、
を備える密封構造において、
前記シールリングは、
径方向の肉厚が薄く、周方向に対して180°未満の範囲で設けられる薄肉部と、該薄肉部の内周面よりも径方向内側に突出するように構成されることで、該薄肉部よりも径方向の肉厚が厚い厚肉部とから構成されると共に、
前記合口部は前記薄肉部に設けられ、
前記厚肉部の両側面における各内周面側の端部には、前記環状溝の溝底両端の隅部との間で隙間を形成させるための凹部が全域に亘ってそれぞれ形成されていることを特徴とする。
前記薄肉部の内周面の曲率半径をRA,前記厚肉部の内周面の曲率半径をRB,前記凹部が設けられた部分のうち径方向の最も大きな部位における曲率半径をRBX,湾曲面で構成された前記隅部のうち径方向の最も大きな部位における外径の半分をRC,前記環状溝の溝底における外径の半分をRDとすると、
RA>RCと、
RBX>RC>RB>RD
のいずれも満たされるとよい。
図1~図8を参照して、本発明の実施例に係るシールリング及び密封構造について説明する。なお、本実施例に係るシールリング及び密封構造は、自動車用のATやCVTなどの変速機において、油圧を保持させるために、相対的に回転する軸とハウジングとの間の環状隙間を封止する用途に用いられるものである。また、以下の説明において、「高圧側」とは、シールリングの両側に差圧が生じた際に高圧となる側を意味し、「低圧側」とは、シールリングの両側に差圧が生じた際に低圧となる側を意味する。
特に、図1~図5を参照して、本実施例に係るシールリング100について説明する。図1は本発明の実施例に係るシールリングの側面図である。図2は本発明の実施例に係るシールリングの側面図の一部拡大図であり、図1中の丸で囲った部分を拡大した図である。図3は本発明の実施例に係るシールリングの側面図の一部拡大図であり、図1中の丸で囲った部分の反対側の面を拡大した図である。図4は本発明の実施例に係るシールリングの外周面側から見た図の一部拡大図であり、図1中の丸で囲った部分を外周面側から見た図である。図5は本発明の実施例に係るシールリングの内周面側から見た図の一部拡大図であり、図1中の丸で囲った部分を内周面側から見た図である。
特に、図6及び図7を参照して、本実施例に係る密封構造について説明する。図6及び図7は本発明の実施例に係る密封構造の模式的断面図であり、図6中のシールリング100は図2中のAA断面図であり、図7中のシールリング100は図1中のBB断面図である。図6及び図7においては、エンジンがかかり、シールリング100を介して、左側の領域に比べて右側の領域の流体圧力の方が高くなった状態を示している。この状態で、シールリング100は、環状溝210における低圧側の側壁面211と、ハウジング300における軸孔310の内周面とに対してそれぞれ密着することで、軸200とハウジング300との間の環状隙間を封止する。
外力が作用していない状態におけるシールリング100と環状溝210との寸法関係について詳細に説明する。環状溝210の溝底両端の隅部213は、環状溝210の溝底212と溝側面(側壁面211)とを繋ぐ湾曲面により構成されている。ここで、シールリング100における薄肉部100Aの内周面の曲率半径をRAとし、厚肉部100Bの内周面の曲率半径をRBとする。また、シールリング100における凹部120が設けられた部分のうち径方向の最も大きな部位における曲率半径をRBXとし、凹部120の軸線方向の幅をHBとする。そして、環状溝210において、湾曲面で構成された隅部213のうち径方向の最も大きな部位における外径の半分をRCとし、隅部213の幅をHCとし、溝底212における外径の半分をRDとする。
特に、図8を参照して、本実施例に係るハウジングへの軸の挿通作業について説明する。図8は本実施例においてハウジングに軸を挿通させる作業の説明図である。ハウジング300に設けられた軸孔310に、予め環状溝210にシールリング100が装着された軸200が、図中矢印X方向に挿通される。本実施例においては、厚肉部100Bにおける内周面が環状溝210の溝底212に接触した状態となる。そのため、挿通作業時において、軸200の中心軸線Cとシールリング100の中心軸線CSとをほぼ一致させることができる。
本実施例によれば、シールリング100は、薄肉部100Aと厚肉部100Bにより構成され、薄肉部100Aは周方向に対して180°未満の範囲に設けられている。これにより、ハウジング300への軸200の挿通作業時においては、シールリング100における厚肉部100Bの内周面が、軸200に設けられた環状溝210の溝底212に対して接触した状態となる。また、厚肉部100Bの両側面における各内周面側の端部には、環状溝210の溝底両端の隅部213との間で隙間を形成させるための凹部120が全域に亘ってそれぞれ形成されている。従って、環状溝210の側壁面211に対するシールリング100の密着が妨げられることはないため、シール性が維持されつつ、厚肉部100Bの肉厚を厚くすることで、ハウジング300への軸200の挿通作業時に、軸200の中心軸線Cに対するシールリング100の中心軸線CSのずれを少なくさせることが可能となる。これにより、挿通作業時において、シールリング100が軸200の外周表面よりも下方に飛び出してしまうことを抑制することができる。従って、シールリング100がハウジング300の先端に突き当たってしまうことを抑制することができ、シールリング100が損傷してしまうことを抑制することができる。
本実施例においては、シールリング100がPTFE製の場合を示したが、本発明におけるシールリングの材料としては、PTFEに限らず、他の樹脂材料を用いることができる。本発明においては、シールリングがハウジングに突き当たって損傷してしまうことを抑制できるため、柔らかい樹脂材料が採用された場合に特に効果的である。
100A 薄肉部
100B 厚肉部
110 合口部
111 第1嵌合凸部
112 第2嵌合凸部
113 第2嵌合凹部
114 第1嵌合凹部
115 端面
116 端面
120 凹部
200 軸
210 環状溝
211 側壁面
212 溝底
213 隅部
300 ハウジング
310 軸孔
Claims (7)
- 軸の外周面側に設けられた環状溝に装着され、前記軸とハウジングとの間の環状隙間を封止する樹脂製のシールリングであって、
前記環状溝における低圧側の側壁面と、前記ハウジングにおける前記軸が挿通される軸孔の内周面とに対してそれぞれ密着することで、前記環状隙間を封止すると共に、周方向の1箇所には合口部が設けられているシールリングにおいて、
径方向の肉厚が薄く、周方向に対して180°未満の範囲で設けられる薄肉部と、該薄肉部の内周面よりも径方向内側に突出するように構成されることで、該薄肉部よりも径方向の肉厚が厚い厚肉部とから構成されると共に、
前記合口部は前記薄肉部に設けられ、
前記厚肉部の両側面における各内周面側の端部には、前記環状溝の溝底両端の隅部との間で隙間を形成させるための凹部が全域に亘ってそれぞれ形成されていることを特徴とするシールリング。 - 前記合口部は、外周面側及び両側壁面側のいずれから見ても階段状に切断されることにより、切断部を介して一方の側の外周面側には第1嵌合凸部及び第1嵌合凹部が設けられ、他方の側の外周面側には第1嵌合凸部が嵌る第2嵌合凹部と第1嵌合凹部に嵌る第2嵌合凸部が設けられていることを特徴とする請求項1に記載のシールリング。
- 前記凹部はヒートプレス加工により形成されることを特徴とする請求項1または2に記載のシールリング。
- 外周面側に環状溝が設けられた軸と、
該軸が挿通される軸孔を有するハウジングと、
前記環状溝における低圧側の側壁面と、前記軸孔の内周面とに対してそれぞれ密着することで、前記軸とハウジングとの間の環状隙間を封止すると共に、周方向の1箇所に合口部が設けられた樹脂製のシールリングと、
を備える密封構造において、
前記シールリングは、
径方向の肉厚が薄く、周方向に対して180°未満の範囲で設けられる薄肉部と、該薄肉部の内周面よりも径方向内側に突出するように構成されることで、該薄肉部よりも径方向の肉厚が厚い厚肉部とから構成されると共に、
前記合口部は前記薄肉部に設けられ、
前記厚肉部の両側面における各内周面側の端部には、前記環状溝の溝底両端の隅部との間で隙間を形成させるための凹部が全域に亘ってそれぞれ形成されていることを特徴とする密封構造。 - 前記環状溝の溝底両端の隅部は、該環状溝の溝底と溝側面とを繋ぐ湾曲面により構成されており、
前記薄肉部の内周面の曲率半径をRA,前記厚肉部の内周面の曲率半径をRB,前記凹部が設けられた部分のうち径方向の最も大きな部位における曲率半径をRBX,湾曲面で構成された前記隅部のうち径方向の最も大きな部位における外径の半分をRC,前記環状溝の溝底における外径の半分をRDとすると、
RA>RCと、
RBX>RC>RB>RD
のいずれも満たされることを特徴とする請求項4に記載の密封構造。 - 前記合口部は、外周面側及び両側壁面側のいずれから見ても階段状に切断されることにより、切断部を介して一方の側の外周面側には第1嵌合凸部及び第1嵌合凹部が設けられ、他方の側の外周面側には第1嵌合凸部が嵌る第2嵌合凹部と第1嵌合凹部に嵌る第2嵌合凸部が設けられていることを特徴とする請求項4または5に記載の密封構造。
- 前記凹部はヒートプレス加工により形成されることを特徴とする請求項4,5または6に記載の密封構造。
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