WO2020195586A1 - Roulement à billes à rainure profonde - Google Patents

Roulement à billes à rainure profonde Download PDF

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Publication number
WO2020195586A1
WO2020195586A1 PCT/JP2020/008735 JP2020008735W WO2020195586A1 WO 2020195586 A1 WO2020195586 A1 WO 2020195586A1 JP 2020008735 W JP2020008735 W JP 2020008735W WO 2020195586 A1 WO2020195586 A1 WO 2020195586A1
Authority
WO
WIPO (PCT)
Prior art keywords
cage
inner ring
deep groove
ball bearing
groove ball
Prior art date
Application number
PCT/JP2020/008735
Other languages
English (en)
Japanese (ja)
Inventor
康続 田中
琢也 小津
Original Assignee
Ntn株式会社
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
Priority claimed from JP2019195223A external-priority patent/JP2020159549A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to CN202080022549.4A priority Critical patent/CN113614398A/zh
Priority to DE112020001379.0T priority patent/DE112020001379T5/de
Publication of WO2020195586A1 publication Critical patent/WO2020195586A1/fr

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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/38—Ball cages
    • F16C33/42—Ball cages made from wire or sheet metal strips
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/80—Labyrinth sealings

Definitions

  • the present invention relates to, for example, a deep groove ball bearing used for a guide roller of a film stretching machine tenta clip, particularly a deep groove ball bearing capable of suppressing grease leakage.
  • This deep groove ball bearing is composed of an inner ring 101, an outer ring 102, a ball 103, a waveform cage 104, and a sealing plate 105.
  • the outer diameter side of the sealing plate 105 is fixed to both ends of the outer ring 102 in the axial direction, the inner diameter side is the free end, and the sealing plate 105 faces the inner ring 101 with a minute gap g.
  • the ball 103 is held by the corrugated cage 104, and when the bearing rotates, the grease adhering to the surface of the ball 103 is scraped off by the cage pocket edge 104b.
  • the grease that has been scraped off and accumulated may adhere to the outer diameter surface 101b of the inner ring 101 and leak to the outside of the bearing through the gap g between the sealing plate 105 and the inner ring 101.
  • Patent Document 1 Conventionally, a technique for preventing grease from leaking to the outside of a deep groove ball bearing is disclosed in Patent Document 1 or Patent Document 2.
  • Patent Document 1 uses a crown type cage, makes the pocket outer diameter side opening diameter and the inner diameter side opening diameter of the crown type cage the same, and is outside the rolling element pitch diameter.
  • the wall thickness of the cage on the diameter side is larger than that on the inner diameter side, the amount of grease scraped from the surface of the rolling element to the cage pocket is reduced, local retention is suppressed, and leakage to the outside is prevented. It is supposed to be possible.
  • the amount of grease scraped off the edge of the cage pocket is proportional to the surface area of the rolling element, and whether or not the scraped grease adheres to the inner ring depends on the distance between the inner diameter of the cage and the outer diameter of the inner ring. .. Therefore, it is necessary to determine the inner diameter of the cage at the same time as the distance from the outer diameter of the inner ring while considering the diameter of the rolling element.
  • the grease scraped off in the cage pocket is removed by denting the inner diameter portion of the pocket position when the waveform cage is viewed from the axial direction in an arc shape and keeping it away from the outer diameter of the inner ring. This is to prevent it from adhering to the inner ring and leaking from the bearing.
  • Patent Document 2 requires a special shape and a jig to align the arcuate recess of the cage with the circumferential position of the pocket, resulting in an increase in cost.
  • the above recess has a structure in which the radial distance between the inner diameter of the cage and the outer diameter of the inner ring approaches from the deepest part to the shallowest part. Therefore, as the bearing rotation time elapses, the grease scraped off along the shape of the bearing accumulates, which may eventually adhere to the outer diameter of the inner ring and cause grease leakage.
  • the present invention has an object of preventing grease leakage without increasing the cost as compared with the conventional bearing.
  • the present invention presents an outer ring, an inner ring, a plurality of balls assembled between the outer ring raceway surface and the inner ring raceway surface, and the balls in the circumferential direction on the raceway surfaces of the inner ring and the outer ring.
  • a deep groove ball bearing consisting of a cage that holds evenly distributed and at least one sealing plate that is fixed to the axial end of the outer ring and has a gap between the axial end of the inner ring, the cage is an annulus.
  • the radial gap ei between the cage and the inner ring can be surely secured, so that the grease scraped from the surface of the ball to the cage adheres to the outer diameter surface of the inner ring. This can prevent leakage to the outside.
  • the deep groove ball bearing according to the present invention can be used as a guide roller for a film stretching machine tenta clip, and in that case, it is used for outer ring rotation.
  • the relationship between the radial gap ei between the inner diameter surface of the cage and the outer diameter surface of the inner ring and the size of the ball (diameter Dw) is set to 0.11 ⁇ Dw ⁇ ei ⁇ 0.35 ⁇ Dw.
  • a plurality of balls 3 are interposed between the raceway surface 1a of the inner ring 1 and the raceway surface 2a of the outer ring 2, and the cage 4 holds the balls 3.
  • Is provided, and non-contact type sealing plates 5 for sealing the bearing space are provided on both sides.
  • Grease (not shown) is sealed in the space surrounded by the inner ring 1, the outer ring 2, and the sealing plate 5.
  • the cage 4 has pockets 50 for holding each ball 3 at a plurality of locations in the circumferential direction, and the inner surface of each pocket 50 has a concave spherical surface shape. is there.
  • the cage 4 is formed by stacking two annular cage half bodies 51 shown in a perspective view in FIG. 3 facing each other in the axial direction and inserting the rivet 53 into the rivet hole 52 as shown in FIG. They are joined together and configured as one.
  • These cage half bodies 51 have a plurality of spherical shell-shaped plate portions 50A having a partially spherical shell shape whose inner surface forms half of the pocket 50, and the flat plate portion 51a which is a portion between adjacent pockets 50.
  • the spherical shell-shaped plate portions 50A are alternately arranged in the circumferential direction.
  • the spherical shell-shaped plate portion 50A is a portion that becomes a part of the spherical shell, in other words, is a counter-sink-shaped bulging portion in which both the inner and outer surfaces are spherical.
  • the projected shape of the cage half body 51 in the axial direction is a ring shape having a constant radial width over the entire circumference.
  • the inner diameter of the cage 4 is a single circular shape, and as shown in FIG. 1, the minimum radial distance (radial gap ei) between the inner diameter surface 4a of the cage and the outer diameter surface 1b of the inner ring and the size of the ball 3
  • the relationship with Sa (diameter Dw) is set as follows. 0.11 x Dw ⁇ ei ⁇ 0.35 x Dw
  • FIG. 6 is a graph showing the test results of measuring the amount of grease leakage from the bearing in which the ei is appropriately changed, and the result of reaching the lower limit of the ei to 0.11 ⁇ Dw can be derived from this graph.
  • the test conditions are as follows.
  • ei is ei ⁇ 0.35 ⁇ Dw and the range is until the inner diameter surface 4a of the cage matches the pitch diameter of the rolling element. This is to avoid a decrease in strength due to insufficient dimensions of the cage 4 in the radial direction.
  • the relationship between the radial gap ei of the inner ring inner diameter surface 4a and the inner ring outer diameter surface 1b and the size of the ball 3 (diameter Dw) is set to 0.11 ⁇ Dw ⁇ ei ⁇ 0.35 ⁇ Dw.
  • the sealing plate 5 is composed of an annular core metal 6 and a rubber-like member 7 integrally fixed to the core metal 6, and the outer peripheral portion is fitted into a seal mounting groove 8 formed on the inner peripheral surface of the outer ring 2. It is fixed in the combined state.
  • the rubber-like member 7 is made of synthetic rubber
  • the core metal 6 is made of steel plate.
  • a seal groove 9 composed of a circumferential groove is formed in the inner ring 1 at a position corresponding to the inner diameter portion of each sealing plate 5, and a labyrinth seal is provided between the inner diameter side end of the sealing plate 5 and the sealing groove 9 of the inner ring 1.
  • the gap g to be formed is formed.
  • the seal mounting groove 8 and the seal groove 9 are finished by turning.
  • the deep groove ball bearing according to the present invention can be suitably used as a guide roller for a film stretching machine tenta clip.
  • a guide roller for a film stretching machine tenta clip it is used for outer ring rotation.
  • FIGS. 4 and 5 show an example of a film stretching machine 16 using a deep groove ball bearing according to the present invention.
  • the film stretching machine 16 includes an extruder 19 that melts the thermoplastic polymer compound 17 and extrudes it as an unstretched film 18, and a cooling drum 20 that receives the extruded film 18.
  • a feed roller 21 that feeds the film 18 cooled by the cooling drum 20, a water tank 22 that applies a humidity control treatment to the film 18 fed by the feed roller 21, and a film 18 that has been humidity-controlled by the water tank 22 are sandwiched. It is provided with a drainage device 23 for removing water droplets on the surface of the film.
  • it includes a biaxial stretching machine 29 that biaxially stretches the film 18 after the draining treatment in the vertical and horizontal directions, and a recovery roller 30 that winds up the film 18 formed by the biaxial stretching machine 29.
  • the lateral stretching mechanism 40 shown in FIG. 5 is provided as a component of the biaxial stretching machine 29.
  • the lateral stretching mechanism 40 is provided with a tenta clip 31.
  • the lateral stretching mechanism 40 is arranged on both the left and right sides of the film 18 to be sent, and the guide rails 33 and 34 and the guide rails 33 and 34 in which the distance between the guides gradually widens in the traveling direction of the line are gradually widened.
  • a plurality of tenta clips 31 that circulate on the line in the traveling direction are provided.
  • the tenta clip 31 has a grip portion 32 that grips the end portion of the film 18, and guide bearings 35 and 36 that roll on the guide rails 33 and 34 composed of closed loops.
  • the tenta clip 31 plays a role of extending the film 18 in the lateral direction by advancing in the traveling direction along the guide rails 33 and 34 in a state where both ends of the film 18 are gripped by the grip portion 32.
  • the guide bearings 35, 36 of the tenta clip 31 play a role of rolling and guiding the tenta clip 31 along the guide rails 33, 34, respectively.
  • the guide bearing 35 that rolls on the guide surface in the horizontal direction is installed on the fixed shaft 37 in the horizontal direction (horizontal posture).
  • the guide bearing 36 that rolls on the guide surface in the vertical direction is installed on the fixed shaft 38 in the vertical direction (vertical posture).
  • the deep groove ball bearing according to the present invention shown in FIG. 1 is used as the guide bearing attached to the fixed shaft 38 in the vertical posture.
  • the deep groove ball bearing of the present invention can be applied to the guide roller of the film stretching machine tenta clip without increasing the cost as compared with the conventional bearing. it can.
  • the plate thickness of the cage 4 may be arbitrarily selected according to the material and strength. Further, as the material of the cage 4, cold rolled steel or stainless steel can be selected, and nitriding treatment may be performed if necessary.
  • ceramic may be used in addition to steel.
  • a grease in which the base oil is fluorine oil and the thickener is PTFE or boron nitride can be selected.
  • Inner ring 1a Track surface 1b: Inner ring outer diameter surface 2: Outer ring 2a: Track surface 3: Ball 4: Cage 4a: Cage inner diameter surface 5: Sealing plate 16: Film stretching machine 31: Tenta clip Dw: Diameter ei : Radial gap

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention concerne un roulement à billes à rainure profonde pourvu d'une cage ondulée, qui est utilisé dans un rouleau de guidage d'une pince de rame d'une machine d'étirage de film et peut supprimer une fuite de graisse. Un espace de direction radiale (ei) entre une surface radialement interne (4a) d'une cage et une surface radialement externe (1b) d'une bague intérieure et une taille (diamètre Dw) d'une bille (3) sont réglés pour satisfaire la relation 0,11 × Dw ≤ ei < 0,35 × Dw. Par conséquent, la graisse raclée sur la surface de la bille (3) par la cage (4) ne peut pas fuir vers l'extérieur grâce à un espace (g) prévu entre un bord radialement interne d'une plaque d'étanchéité (5) et la surface radialement externe (1b) de la bague intérieure.
PCT/JP2020/008735 2019-03-22 2020-03-02 Roulement à billes à rainure profonde WO2020195586A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080022549.4A CN113614398A (zh) 2019-03-22 2020-03-02 深沟球轴承
DE112020001379.0T DE112020001379T5 (de) 2019-03-22 2020-03-02 Rillenkugellager

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2019-054021 2019-03-22
JP2019054021 2019-03-22
JP2019-195223 2019-10-28
JP2019195223A JP2020159549A (ja) 2019-03-22 2019-10-28 深溝玉軸受

Publications (1)

Publication Number Publication Date
WO2020195586A1 true WO2020195586A1 (fr) 2020-10-01

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ID=72610013

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/008735 WO2020195586A1 (fr) 2019-03-22 2020-03-02 Roulement à billes à rainure profonde

Country Status (1)

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WO (1) WO2020195586A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010065820A (ja) * 2008-09-12 2010-03-25 Ntn Corp テンタクリップガイド用軸受
JP2011196422A (ja) * 2010-03-18 2011-10-06 Ntn Corp 転がり軸受

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010065820A (ja) * 2008-09-12 2010-03-25 Ntn Corp テンタクリップガイド用軸受
JP2011196422A (ja) * 2010-03-18 2011-10-06 Ntn Corp 転がり軸受

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