WO2026009366A1 - Joint d'étanchéité à l'huile - Google Patents

Joint d'étanchéité à l'huile

Info

Publication number
WO2026009366A1
WO2026009366A1 PCT/JP2024/024203 JP2024024203W WO2026009366A1 WO 2026009366 A1 WO2026009366 A1 WO 2026009366A1 JP 2024024203 W JP2024024203 W JP 2024024203W WO 2026009366 A1 WO2026009366 A1 WO 2026009366A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotating body
seal portion
seal
annular
fitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/024203
Other languages
English (en)
Japanese (ja)
Inventor
豊 今川
将幸 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Skg Inc
Original Assignee
Skg Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Skg Inc filed Critical Skg Inc
Priority to PCT/JP2024/024203 priority Critical patent/WO2026009366A1/fr
Priority to JP2024555005A priority patent/JP7575152B1/ja
Priority to TW113129868A priority patent/TW202603290A/zh
Publication of WO2026009366A1 publication Critical patent/WO2026009366A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • 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
    • F16J15/3212—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 with metal springs

Definitions

  • This disclosure relates to an oil seal.
  • Patent Document 1 describes an oil seal equipped with a seal portion formed by integrally molding a rubber-like elastic material onto a metal ring.
  • This seal portion has an outer circumferential seal portion fitted to the inner circumferential surface of the non-rotating body, a seal lip extending from the flange of the metal ring toward the sealed fluid side and abutting against the outer circumferential surface of the rotating body, and a dust lip extending from the flange of the metal ring to the side opposite the seal lip and abutting against the outer circumferential surface of the rotating body.
  • the seal lip is tightened against the rotating body by an annular spring incorporated in the oil seal.
  • the oil seal described in Patent Document 1 has a metal ring inserted into the sealing portion, so if the sealing portion wears out, the entire oil seal must be replaced. Furthermore, this oil seal has a complex, integrated shape and a complicated structure.
  • This disclosure was made in light of the above situation, and aims to provide an oil seal with a simple structure that allows for easy replacement of worn parts.
  • the oil seal according to the present disclosure comprises: An oil seal provided between an inner peripheral surface of an open non-rotating body and an outer peripheral surface of a rotating body that rotates relative to the non-rotating body, a seal portion formed in an annular shape from an elastic resin and fitted to the outer circumferential surface of the rotating body; an annular spring that presses the seal portion toward the rotating body; an annular body that is separate from the seal portion and is fitted onto the inner circumferential surface of the non-rotating body, the seal portion has an inner surface located on the side of the object to be sealed, an outer surface located opposite the inner surface, and an inner peripheral contact surface that contacts the outer peripheral surface of the rotating body, the annular body has a facing portion facing the inner circumferential surface of the non-rotating body and a cover covering the outer surface of the seal portion,
  • the seal portion has a groove in which the spring is fitted and which narrows toward the rotating body, The spring fitted in the groove presses the inner peripheral contact surface of the seal portion against the rotating body, and presse
  • This disclosure makes it possible to provide an oil seal with a simple structure that allows for easy replacement of worn parts.
  • FIG. 3 is a cross-sectional view of the oil seal according to the first embodiment of the present disclosure, and is an enlarged view of part A in FIG. 2 .
  • FIG. 2 is a cross-sectional view of an oil seal and a bearing according to the first embodiment.
  • 1 is a cross-sectional view of a reducer to which an oil seal according to a first embodiment is applied.
  • FIG. 4 is a cross-sectional view of an oil seal according to a second embodiment of the present disclosure.
  • FIG. 10 is a cross-sectional view of an oil seal according to a third embodiment of the present disclosure.
  • an oil seal 101 As shown in Fig. 1, an oil seal 101 according to the first embodiment is provided between an inner peripheral surface 2i of an open non-rotating body 2 and an outer peripheral surface 3o of a rotating body 3 that rotates relative to the non-rotating body 2.
  • the non-rotating body 2 constitutes the outer ring of a bearing 1
  • the rotating body 3 constitutes the inner ring of the bearing 1.
  • Fig. 1 is an enlarged view of part A in Fig. 2.
  • the rotating body 3 is rotatable about an axis line AX shown in Fig. 3.
  • Bearing 1 is, for example, a cross roller bearing, and is a component of a reducer.
  • Various well-known configurations can be applied to reducers, but as an example, we will briefly explain reducer 200 shown in Figure 3.
  • the reducer 200 is configured as a wave gear device, and includes a wave generator 210 , a rigid internal gear 220 , a flex portion 230 , a rigid external gear 240 , a bearing 1 , and an oil seal 101 .
  • the wave generator 210 comprises a cam 211 that rotates around the axis AX in response to a rotational input, and an annular wave bearing 212 attached to the outer circumferential surface of the cam 211.
  • the cam 211 is formed on the outer periphery of a hollow shaft and has N poles (N is an integer greater than or equal to 2) positioned at equal intervals in the circumferential direction.
  • N is an integer greater than or equal to 2
  • the rigid internal gear 220 is made of a known material such as metal and has rigidity, and surrounds the wave bearing 212.
  • the flex section 230 is made of a metal material such as special steel and is formed into a flexible cylindrical shape, and includes a flexible external gear 231 and a flexible internal gear 232.
  • the flexible external gear 231 is fitted onto the outer periphery of the wave bearing 212 and is deflected at a position corresponding to the pole of the cam 211 to mesh with the rigid internal gear 220.
  • the flexible internal gear 232 deflects in response to the deflection of the flexible external gear 231 by the wave generator 210, and meshes with the rigid external gear 240.
  • the rigid external gear 240 is made of a known material such as metal and is formed into a ring shape, having rigidity.
  • a speed ratio occurs between the cam 211 and the flex portion 230 depending on the difference in the number of teeth between the flexible external gear 231 and the rigid internal gear 220. Meanwhile, the number of teeth between the flexible internal gear 232 and the rigid external gear 240 may be the same or different. If there is a difference in the number of teeth between the flexible internal gear 232 and the rigid external gear 240, a speed ratio occurs between the flex portion 230 and the rigid external gear 240 depending on the difference in the number of teeth. In any case, the reducer 200 decelerates the rigid external gear 240 relative to the rotational input based on the relationship between the number of teeth of the rigid internal gear 220, the flexible external gear 231, the flexible internal gear 232, and the rigid external gear 240.
  • the non-rotating body 2 (outer ring) of the bearing 1 is fixed directly or indirectly to the rigid internal gear 220. Meanwhile, the rotating body 3 (inner ring) of the bearing 1 is fixed to the rigid external gear 240. The rotating body 3, which rotates together with the rigid external gear 240, is connected to an output target (not shown).
  • the oil seal 101 is provided inside a recess formed across the boundary between the non-rotating body 2 (outer ring) and the rotating body 3 (inner ring) of the bearing 1. This recess is formed in an annular shape when viewed in the axial direction.
  • the oil seal 101 includes a seal portion 10, a spring 20, an annular body 30, and a fitting portion 40.
  • the seal portion 10 is fitted onto the outer peripheral surface 3o of the rotating body 3 and is formed into a ring shape from elastic resin.
  • the seal portion 10 is made of a well-known elastomer such as NBR (Nitrile Butadiene Rubber).
  • NBR Nirile Butadiene Rubber
  • the seal portion 10 has an inner surface 11 located on the side of the object to be sealed, an outer surface 12 located opposite the inner surface, and an inner peripheral contact surface 13 that comes into contact with the outer peripheral surface 3o of the rotating body 3.
  • the side to be sealed such as oil or grease, is marked "In” and the side facing the atmosphere is marked “Out” (the same applies to Figures 4 and 5 described below).
  • a spring 20 is fitted between the inner surface 11 and outer surface 12 of the seal portion 10, and a groove 14 is formed that narrows toward the rotating body 3.
  • the groove 14 is formed around the entire circumference of the seal portion 10 and is V-shaped in cross section.
  • the spring 20 is a garter spring that is annular when viewed axially and surrounds the entire circumference of the seal portion 10.
  • the spring 20 tightens the seal portion 10 to the rotating body 3. In other words, the spring 20 presses the seal portion 10 toward the rotating body 3.
  • the spring 20 is fitted into the groove 14 of the seal portion 10, pressing the inner contact surface 13 of the seal portion 10 against the rotating body 3 (specifically, the outer periphery 3o of the rotating body 3), expanding the seal portion 10 in the axial direction.
  • the annular body 30 has an annular shape when viewed in the axial direction, and is fitted onto the inner peripheral surface 2i of the non-rotating body 2.
  • the annular body 30 is formed by metal press processing.
  • the annular body 30 is not limited to metal, and may be made of engineering plastic or the like, as long as it can ensure rigidity.
  • the annular body 30 is separate from the seal portion 10, that is, it is separable from the seal portion 10.
  • the annular body 30 has a facing portion 31 that faces the inner circumferential surface 2i of the non-rotating body 2, and a cover 32 that covers the outer surface 12 of the seal portion 10.
  • the integrated shape of the facing portion 31 and the cover 32 forms an L-shape in cross section, as shown in Figure 1.
  • the seal portion 10 is expanded in the axial direction by the spring 20 fitted into the groove 14 of the seal portion 10. As a result, the outer surface 12 of the seal portion 10 is pressed against the cover 32, and the inner surface 11 is pressed against the rotating body 3 in the axial direction.
  • the fitting portion 40 is applied by lining or coating to the opposing portion 31 of the annular body 30 and comes into contact with the inner circumferential surface 2i of the non-rotating body 2.
  • the annular body 30 is fitted into the inner circumferential surface 2i via the fitting portion 40.
  • the fitting portion 40 is made of rubber, resin, etc., and is applied around the entire circumference of the opposing portion 31. The fitting portion 40 makes it easier to fix the annular body 30 to the inner circumferential surface 2i of the non-rotating body 2 and prevents wear between the annular body 30 and the non-rotating body 2.
  • a seal is formed between the mating portion 40 on the opposing portion 31 of the annular body 30 and the inner circumferential surface 2i of the non-rotating body 2.
  • the seal member 10 is press-fit into the rotating body 3 and rotates with the rotating body 3. Therefore, a seal is formed between the inner circumferential contact surface 13 and the outer circumferential surface 3o of the rotating body 3.
  • the seal member 10 slides against the annular body 30, which is fixed to the non-rotating body 2.
  • a lubricant is filled between the cover 32 of the annular body 30 and the outer surface 12 of the seal member 10, allowing the outer surface 12 to slide against the annular body 30 with low friction as the rotating body 3 rotates. While allowing the seal member 10 to slide against the annular body 30, the outer surface 12 is pressed against the cover 32 as described above, providing a good seal between the outer surface 12 and the cover 32.
  • the oil seal 102 according to the second embodiment includes a seal portion 10, a spring 20, an annular body 30, and a fitting portion 40.
  • the annular body 30 according to the second embodiment includes a plate 33 in addition to a facing portion 31 and a cover 32.
  • the plate 33 covers the inner surface 11 of the seal portion 10 and is molded from metal.
  • the plate 33 comes into axial contact with a recess provided in the non-rotating body 2.
  • a resin layer may be formed by lining or coating on the portion of the plate 33 that comes into contact with the recess.
  • the opposing portion 31, cover 32, and plate 33 that make up the annular body 30 of the second embodiment are generally U-shaped in cross section.
  • the plate 33 may be integral with the opposing portion 31 and cover 32, or may be a separate body.
  • the plate 33 is not limited to metal, and may be made of engineering plastic or the like, as long as sufficient rigidity can be ensured.
  • the seal portion 10 is expanded in the axial direction by the spring 20 fitted into the groove 14 of the seal portion 10. This presses the outer surface 12 of the seal portion 10 against the cover 32, and the inner surface 11 against the plate 33.
  • a seal is formed between the fitting portion 40 on the opposing portion 31 of the annular body 30 and the inner surface 2i of the non-rotating body 2. Furthermore, in the second embodiment, the seal portion 10 is press-fit into the rotating body 3 and rotates together with the rotating body 3. Therefore, a seal is formed between the inner peripheral contact surface 13 and the outer peripheral surface 3o of the rotating body 3. When the rotating body 3 rotates, the seal portion 10 slides against the annular body 30 fixed to the non-rotating body 2. A lubricant is filled between the cover 32 and the outer surface 12 of the seal portion 10, and between the plate 33 and the inner surface 11 of the seal portion 10, so that when the rotating body 3 rotates, the outer surface 12 and inner surface 11 can slide against the annular body 30 with low friction.
  • an oil seal 103 according to the third embodiment includes a seal portion 10, a spring 20, an annular body 30, and a fitting portion 40.
  • the annular body 30 of the third embodiment includes a facing portion 31, a cover 32, and a plate 33, similar to the second embodiment.
  • the rotating body 3 rotates relative to the seal portion 10.
  • the outer peripheral surface 3o of the rotating body 3 slides against the inner peripheral contact surface 13 of the seal portion 10. Therefore, in the third embodiment, a lubricant is filled between the inner peripheral contact surface 13 and the outer peripheral surface 3o of the rotating body 3.
  • the seal portion 10 has a recess 13D that is recessed radially from the inner circumferential contact surface 13 and extends around the entire circumference of the inner circumferential contact surface 13. This recess 13D reduces resistance when the rotating body 3 slides against the seal portion 10.
  • the seal portion 10 according to the third embodiment functions as a seal lip.
  • the seal portion 10 and the annular body 30 are constructed separately. Therefore, if the seal portion 10 wears out, only the seal portion 10 can be replaced.
  • oil seals 101, 102, and 103 have a simple structure, unlike conventional oil seals in which a metal ring is inserted into the sealing portion. Oil seals 101, 102, and 103, with their simple structure, are easy to manufacture and assemble.
  • oil seals 101, 102, and 103 are constructed from a combination of simply shaped parts, so they can be shorter in the axial direction than conventional oil seals. This prevents the bearing 1, in which oil seals 101, 102, and 103 are installed, from becoming axially long and heavy.
  • the bearing 1 is not limited to a cross roller bearing, but may also be a roller bearing, a ball bearing, etc.
  • the reducer 200 to which the bearing 1 is applied is not limited to a strain wave gear device, but may also be a planetary gear reducer, etc.
  • the non-rotating body 2 and rotating body 3 to which the oil seals 101, 102, and 103 are applied are not limited to being components of the bearing 1, but may also be components of various devices.
  • the non-rotating body 2 may be a housing in a vehicle transfer device, and the rotating body 3 may be inserted into the housing.
  • At least one of the oil seals 101, 102, and 103 described above has the characteristics described in the following notes.
  • annular body further includes a plate covering the inner surface of the seal portion; The spring fitted in the groove presses the inner surface of the seal portion against the plate. 2.
  • the rotor further includes a fitting portion that is provided on the opposing portion by lining or coating and that comes into contact with the inner circumferential surface of the non-rotating body. 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing Devices (AREA)

Abstract

L'invention concerne un joint d'étanchéité à l'huile (101) comprenant une partie joint d'étanchéité (10) qui est ajustée sur la surface périphérique externe (3o) d'un corps rotatif (3) et est formée sous une forme annulaire, un ressort annulaire (20), et un corps annulaire (30) qui est séparé de la partie joint d'étanchéité (10) et est ajusté dans la surface périphérique interne (2i) d'un corps non rotatif (2). La partie joint d'étanchéité (10) présente une surface interne (11), une surface externe (12) et une surface de contact périphérique interne (13) qui vient en contact avec la surface périphérique externe (3o). Le corps annulaire (30) présente une partie en vis-à-vis (31) qui fait face à la surface périphérique interne (2i), et un couvercle (32) qui recouvre la surface externe (12). Un ressort (20) est ajusté sur la partie joint d'étanchéité (10), et une rainure (14) qui devient plus étroite vers le corps rotatif (3) est formée. Le ressort (20) ajusté dans la rainure (14) amène la surface de contact périphérique interne (13) à être pressée contre le corps rotatif (3) et amène la surface externe (12) à être pressée contre le couvercle (32).
PCT/JP2024/024203 2024-07-04 2024-07-04 Joint d'étanchéité à l'huile Pending WO2026009366A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2024/024203 WO2026009366A1 (fr) 2024-07-04 2024-07-04 Joint d'étanchéité à l'huile
JP2024555005A JP7575152B1 (ja) 2024-07-04 2024-07-04 オイルシール
TW113129868A TW202603290A (zh) 2024-07-04 2024-08-09 油封

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2024/024203 WO2026009366A1 (fr) 2024-07-04 2024-07-04 Joint d'étanchéité à l'huile

Publications (1)

Publication Number Publication Date
WO2026009366A1 true WO2026009366A1 (fr) 2026-01-08

Family

ID=93254364

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/024203 Pending WO2026009366A1 (fr) 2024-07-04 2024-07-04 Joint d'étanchéité à l'huile

Country Status (3)

Country Link
JP (1) JP7575152B1 (fr)
TW (1) TW202603290A (fr)
WO (1) WO2026009366A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157270U (fr) * 1984-09-20 1986-04-17
JP2007270873A (ja) * 2006-03-30 2007-10-18 Jtekt Corp 密封装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157270U (fr) * 1984-09-20 1986-04-17
JP2007270873A (ja) * 2006-03-30 2007-10-18 Jtekt Corp 密封装置

Also Published As

Publication number Publication date
TW202603290A (zh) 2026-01-16
JP7575152B1 (ja) 2024-10-29

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